# Cellular **URL:** https://community.sparkfun.com/c/wireless-iot/cellular/93.md [Latest](https://community.sparkfun.com/latest.md) · [Categories](https://community.sparkfun.com/categories.md) · [Tags](https://community.sparkfun.com/tags.md) --- ## [About the Cellular category](https://community.sparkfun.com/t/about-the-cellular-category/59278)
**Author:** [@system](https://community.sparkfun.com/u/system)\ **Replies:** 0\ **Last updated:** [July 8, 2024, 4:06pm UTC](https://community.sparkfun.com/t/about-the-cellular-category/59278 "2024-07-08T16:06:57Z")
Topics relating to Cellular based networking and communication for SparkFun breakout boards. --- ## [SparkFun LTE Stick LARA-R6 Not Responding to UART or USB](https://community.sparkfun.com/t/sparkfun-lte-stick-lara-r6-not-responding-to-uart-or-usb/67294)
**Author:** [@SeanMcT](https://community.sparkfun.com/u/SeanMcT)\ **Replies:** 6\ **Last updated:** [November 14, 2025, 8:53pm UTC](https://community.sparkfun.com/t/sparkfun-lte-stick-lara-r6-not-responding-to-uart-or-usb/67294 "2025-11-14T20:53:49Z")
I’m unable to get the LARA-R6 module to respond to AT commands via UART or enumerate as a USB device. I’ve tested two different LTE STticks with identical results. Setup: SparkFun Artemis Thing Plus SparkFun LTE S… --- ## [LTE CAT M1/NB-IoT Shield - SARA-R4 serial connection issue](https://community.sparkfun.com/t/lte-cat-m1-nb-iot-shield-sara-r4-serial-connection-issue/65963)
**Author:** [@jvdstoel1024](https://community.sparkfun.com/u/jvdstoel1024)\ **Replies:** 2\ **Last updated:** [July 10, 2025, 6:15am UTC](https://community.sparkfun.com/t/lte-cat-m1-nb-iot-shield-sara-r4-serial-connection-issue/65963 "2025-07-10T06:15:46Z")
I am able to make a serial connection with a serial debugger. The SARA-R4 bd acknowledges at most one character at a time and then ignores the remaining. It is not possible to send AT commands because of this. I follo… --- ## [AWS IoT ExpressLink SARA-R5 Starter Kit V2 can't connect to the LTE](https://community.sparkfun.com/t/aws-iot-expresslink-sara-r5-starter-kit-v2-cant-connect-to-the-lte/65721)
**Author:** [@caffrey9307](https://community.sparkfun.com/u/caffrey9307)\ **Replies:** 0\ **Last updated:** [June 26, 2025, 3:14am UTC](https://community.sparkfun.com/t/aws-iot-expresslink-sara-r5-starter-kit-v2-cant-connect-to-the-lte/65721 "2025-06-26T03:14:29Z")
I activated the SIM that came along in the dev kit and tried hard to connect but still ended up with ERR14 2 UNABLE TO CONNECT. I did set the device data endpoint and APN into it. Is there anything that I have missed? --- ## [SARA R5 function board appears to hang after an unpredictable amount of time](https://community.sparkfun.com/t/sara-r5-function-board-appears-to-hang-after-an-unpredictable-amount-of-time/46828)
**Author:** [@DougMcK](https://community.sparkfun.com/u/DougMcK)\ **Replies:** 8\ **Last updated:** [May 29, 2025, 4:35pm UTC](https://community.sparkfun.com/t/sara-r5-function-board-appears-to-hang-after-an-unpredictable-amount-of-time/46828 "2025-05-29T16:35:25Z")
I’ve been experimenting with the SARA R5 using both LTE and GPS functionality. At unpredictable intervals (about a day or so) the board becomes unresponsive to commands over UART. The problem is sufficiently rare that d… --- ## [Sara R5 sending https post example?](https://community.sparkfun.com/t/sara-r5-sending-https-post-example/64767)
**Author:** [@tyrian869](https://community.sparkfun.com/u/tyrian869)\ **Replies:** 2\ **Last updated:** [May 29, 2025, 8:24pm UTC](https://community.sparkfun.com/t/sara-r5-sending-https-post-example/64767 "2025-05-29T20:24:18Z")
I have a simple question for yeah, It’s regarding how to send HTTPS Post command using SaraR5? + Esp32. As I have not been able to find any solid info on how to do this, would anyone be able to help me with this possibil… --- ## [Unable to Establish Secure HTTPS/FTPS Connection Using LARA-R6401 ("Cannot Set Secure Socket")](https://community.sparkfun.com/t/unable-to-establish-secure-https-ftps-connection-using-lara-r6401-cannot-set-secure-socket/64746)
**Author:** [@Shravya\_Katakam](https://community.sparkfun.com/u/Shravya_Katakam)\ **Replies:** 2\ **Last updated:** [April 28, 2025, 5:34am UTC](https://community.sparkfun.com/t/unable-to-establish-secure-https-ftps-connection-using-lara-r6401-cannot-set-secure-socket/64746 "2025-04-28T05:34:04Z")
Module: u-blox LARA-R6401 (SPARKFUN LTE STICK) Network: Jio India Firmware Version: 2.14 Hi everyone, I’m facing an issue while establishing secure HTTP (HTTPS) and FTP (FTPS) connections on the LARA-R6401 module. Af… --- ## [Unable to connect to LTE GNSS Function Bd, SARA-R5](https://community.sparkfun.com/t/unable-to-connect-to-lte-gnss-function-bd-sara-r5/64834)
**Author:** [@jvdstoel1024](https://community.sparkfun.com/u/jvdstoel1024)\ **Replies:** 0\ **Last updated:** [April 27, 2025, 9:29pm UTC](https://community.sparkfun.com/t/unable-to-connect-to-lte-gnss-function-bd-sara-r5/64834 "2025-04-27T21:29:00Z")
Both the SARA-R5 and the nrf52840 MCU are inserted into a sparkfun Function Zero mainboard. Using Serial for console and Serial1 for the modem. In mySARA.begin(9600), the code never succeeds in connecting. \*\*\* Debug … --- ## [Missing components on SparkFun micro mod LTE GNSS Function Board - SARA-R5?](https://community.sparkfun.com/t/missing-components-on-sparkfun-micro-mod-lte-gnss-function-board-sara-r5/64447)
**Author:** [@tyrian869](https://community.sparkfun.com/u/tyrian869)\ **Replies:** 3\ **Last updated:** [April 7, 2025, 7:29am UTC](https://community.sparkfun.com/t/missing-components-on-sparkfun-micro-mod-lte-gnss-function-board-sara-r5/64447 "2025-04-07T07:29:56Z")
So I’m not sure if this is related to my issue but upon visual inspection of my Sparkfun function board it looks like I’m missing a component and also have a component more then in the advertised image, but also my versi… --- ## [Don't Connect between module SARA-R510M8S-61B with Soracom eSIM (SGEIL01)](https://community.sparkfun.com/t/dont-connect-between-module-sara-r510m8s-61b-with-soracom-esim-sgeil01/63872)
**Author:** [@TruongVu](https://community.sparkfun.com/u/TruongVu)\ **Replies:** 1\ **Last updated:** [April 2, 2025, 8:53pm UTC](https://community.sparkfun.com/t/dont-connect-between-module-sara-r510m8s-61b-with-soracom-esim-sgeil01/63872 "2025-04-02T20:53:45Z")
Hi team, I am testing the SARA-R510M8S module with a Soracom eSIM(SGEIL01). I scanned for available networks, but none were found, even though I have configured the APN and authentication as follows: \[08:22:07.844\] AT+… --- ## [LARA R6 - No Network Stack Over USB](https://community.sparkfun.com/t/lara-r6-no-network-stack-over-usb/63412)
**Author:** [@Donald\_Pitchford](https://community.sparkfun.com/u/Donald_Pitchford)\ **Replies:** 1\ **Last updated:** [February 15, 2025, 12:28am UTC](https://community.sparkfun.com/t/lara-r6-no-network-stack-over-usb/63412 "2025-02-15T00:28:28Z")
In the uBlox Application Development App Note, it states: “Section 4.4: LARA-R6 “00B” product version does not support network connectivity modes over USB.” Does anyone know if this is a temporary issue or a fact of t… --- ## [SARA-R410M not responding to commands](https://community.sparkfun.com/t/sara-r410m-not-responding-to-commands/62228)
**Author:** [@basrijn](https://community.sparkfun.com/u/basrijn)\ **Replies:** 3\ **Last updated:** [December 28, 2024, 12:28am UTC](https://community.sparkfun.com/t/sara-r410m-not-responding-to-commands/62228 "2024-12-28T00:28:29Z")
Hello, I’m running into issues with my " LTE CAT M1/NB-IoT Shield - SARA-R4" board. I wanted to use it as an external shield. It’s powered of USB+LiPo. I did some basic testing with a direct serial connection. Once I g… --- ## [No Response from LARA-R6401 when communicating through UART](https://community.sparkfun.com/t/no-response-from-lara-r6401-when-communicating-through-uart/62343)
**Author:** [@Shravya\_Katakam](https://community.sparkfun.com/u/Shravya_Katakam)\ **Replies:** 2\ **Last updated:** [December 18, 2024, 4:05am UTC](https://community.sparkfun.com/t/no-response-from-lara-r6401-when-communicating-through-uart/62343 "2024-12-18T04:05:47Z")
Hi everyone, I encountered an issue where the LARA-R6401 module was giving no response during UART communication. After debugging, I found that the problem was due to improper line termination — specifically, the absenc… --- ## [SARA-510M8S ATD fails: Operation Not Supported, UDP packet fails: unkown error](https://community.sparkfun.com/t/sara-510m8s-atd-fails-operation-not-supported-udp-packet-fails-unkown-error/60635)
**Author:** [@Nuclear\_Man\_D](https://community.sparkfun.com/u/Nuclear_Man_D)\ **Replies:** 5\ **Last updated:** [November 30, 2024, 8:49am UTC](https://community.sparkfun.com/t/sara-510m8s-atd-fails-operation-not-supported-udp-packet-fails-unkown-error/60635 "2024-11-30T08:49:45Z")
At first I was having an issue that my Teensy 4.1 crashes with the R5 library examples, if we enable debugging this is the output: init: Begin module init. sendCommandWithResponse: Command: E0 init: Module failed echo t… --- ## [SARA-R510M8S bricked after Firmware update](https://community.sparkfun.com/t/sara-r510m8s-bricked-after-firmware-update/61550)
**Author:** [@APX6000](https://community.sparkfun.com/u/APX6000)\ **Replies:** 8\ **Last updated:** [November 15, 2024, 11:03pm UTC](https://community.sparkfun.com/t/sara-r510m8s-bricked-after-firmware-update/61550 "2024-11-15T23:03:56Z")
Firstly, I did search the community and found a few posts with similar issues, but I could find no replies that helped. When I tried to connect my DEV-17272 Asset Tracker to the uBlox m-center software, I received an i… --- ## [SARA-R5 signal strength seems stuck at 99, could it have died??](https://community.sparkfun.com/t/sara-r5-signal-strength-seems-stuck-at-99-could-it-have-died/47169)
**Author:** [@DougMcK](https://community.sparkfun.com/u/DougMcK)\ **Replies:** 7\ **Last updated:** [November 7, 2024, 8:42am UTC](https://community.sparkfun.com/t/sara-r5-signal-strength-seems-stuck-at-99-could-it-have-died/47169 "2024-11-07T08:42:41Z")
Greetings, I am trying to get a SARA-R5 MM function board to connect to LTE in the eastern Carribean. The Global SIM from Hologram has coverage where I am. Both Antennas that I brought have coverage with the local frequ… --- ## [SparkFun Thing Plus possible antenna issues](https://community.sparkfun.com/t/sparkfun-thing-plus-possible-antenna-issues/61488)
**Author:** [@jason081](https://community.sparkfun.com/u/jason081)\ **Replies:** 5\ **Last updated:** [October 29, 2024, 10:25pm UTC](https://community.sparkfun.com/t/sparkfun-thing-plus-possible-antenna-issues/61488 "2024-10-29T22:25:06Z")
Hi I recently purchased SparkFun Thing Plus - nRF9160. The firmware is from zephyr example code to connect to aws iot. The code works perfect for nrf91 dk board. However, when using sparkfun board, we found that the co… --- ## [Data Integration between Sparkfun LTE CatM SARA R4 and ThingsBoard IO](https://community.sparkfun.com/t/data-integration-between-sparkfun-lte-catm-sara-r4-and-thingsboard-io/60945)
**Author:** [@JJ\_J](https://community.sparkfun.com/u/JJ_J)\ **Replies:** 2\ **Last updated:** [September 30, 2024, 10:20pm UTC](https://community.sparkfun.com/t/data-integration-between-sparkfun-lte-catm-sara-r4-and-thingsboard-io/60945 "2024-09-30T22:20:38Z")
Hello everyone. I’m new here and would like to ask for your help. Do you have a tutorial or example for data integration between the SARA R4 LTE Sparkfun board and the Thingsboard platform? The Sparkfun example is aime… --- ## [AWS IoT ExpressLink SARA-R5 Starter Kit V2 Connections registrations issues](https://community.sparkfun.com/t/aws-iot-expresslink-sara-r5-starter-kit-v2-connections-registrations-issues/45866)
**Author:** [@RoIkana](https://community.sparkfun.com/u/RoIkana)\ **Replies:** 8\ **Last updated:** [August 16, 2024, 8:04pm UTC](https://community.sparkfun.com/t/aws-iot-expresslink-sara-r5-starter-kit-v2-connections-registrations-issues/45866 "2024-08-16T20:04:40Z")
Hello, I’m trying to follow the official documentation https://content.u-blox.com/sites/defaul … 042016.pdf when registering for AWS. I don’t see the message “Welcome to u-blox AWS IoT ExpressLink SARA-R5” I do see th… --- ## [Recover bricked SARA-R510M8S in SparkFun MicroMod Asset Tracker Carrier Board](https://community.sparkfun.com/t/recover-bricked-sara-r510m8s-in-sparkfun-micromod-asset-tracker-carrier-board/59363)
**Author:** [@JeronimoSngular](https://community.sparkfun.com/u/JeronimoSngular)\ **Replies:** 1\ **Last updated:** [July 24, 2024, 12:23pm UTC](https://community.sparkfun.com/t/recover-bricked-sara-r510m8s-in-sparkfun-micromod-asset-tracker-carrier-board/59363 "2024-07-24T12:23:55Z")
I was using a SparkFun MicroMod Asset Tracker Carrier Board, which has a SARA-R510M8S 01B-00 modem with fw version 03.15, A00.01 and I wanted to update the fw into latest version. I have followed the MicroMod Update Tool… --- ## [Will there ever be a SARA LTE Stick?](https://community.sparkfun.com/t/will-there-ever-be-a-sara-lte-stick/47661)
**Author:** [@DWSMITH](https://community.sparkfun.com/u/DWSMITH)\ **Replies:** 0\ **Last updated:** [July 2, 2024, 9:01pm UTC](https://community.sparkfun.com/t/will-there-ever-be-a-sara-lte-stick/47661 "2024-07-02T21:01:12Z")
I have a development baseboard that currently holds a ESP32-Devkit-S3 board and a LARA-R6 LTE Stick. My programmer says that the libraries he needs which support the LARA are not nearly as complete as the SARA product, a… --- ## [TECH QUESTION: LTEStick with LARA R6 - AT&T says it's not compatible!](https://community.sparkfun.com/t/tech-question-ltestick-with-lara-r6-at-t-says-its-not-compatible/47364)
**Author:** [@DWSMITH](https://community.sparkfun.com/u/DWSMITH)\ **Replies:** 4\ **Last updated:** [July 2, 2024, 8:41pm UTC](https://community.sparkfun.com/t/tech-question-ltestick-with-lara-r6-at-t-says-its-not-compatible/47364 "2024-07-02T20:41:00Z")
We are designing a low-speed cellular data-only modem for use in the USA (\<1mbps) and we have been trying to get a SIM to use during our development, with our cellular provider AT&T Cellular. When we sent the IMEI data … --- ## [Using SparkFun LTE Stick (LARA-R6) in the Middle East](https://community.sparkfun.com/t/using-sparkfun-lte-stick-lara-r6-in-the-middle-east/47656)
**Author:** [@bas\_kila\_mars2023](https://community.sparkfun.com/u/bas_kila_mars2023)\ **Replies:** 1\ **Last updated:** [July 2, 2024, 5:33pm UTC](https://community.sparkfun.com/t/using-sparkfun-lte-stick-lara-r6-in-the-middle-east/47656 "2024-07-02T17:33:22Z")
Dear all, I recently purchased a SparkFun LTE Stick (LARA-R6), which is based on the LARA-R6401 module designed for North America. As I am located in the Middle East, I require a global module such as the LARA-R6001 for… --- ## [LARA-R6 LTE Stick Firmware Update](https://community.sparkfun.com/t/lara-r6-lte-stick-firmware-update/47453)
**Author:** [@XorLor](https://community.sparkfun.com/u/XorLor)\ **Replies:** 1\ **Last updated:** [May 21, 2024, 7:12pm UTC](https://community.sparkfun.com/t/lara-r6-lte-stick-firmware-update/47453 "2024-05-21T19:12:53Z")
Sparkfun shipped it with version 02.14 but m-center shows version 04.22 is available. Anybody know where to get the update file? I looked everywhere except your mom’s house. --- ## [NTRIP corrections work with some cell phones but not others](https://community.sparkfun.com/t/ntrip-corrections-work-with-some-cell-phones-but-not-others/47396)
**Author:** [@lmc150](https://community.sparkfun.com/u/lmc150)\ **Replies:** 3\ **Last updated:** [May 17, 2024, 1:55pm UTC](https://community.sparkfun.com/t/ntrip-corrections-work-with-some-cell-phones-but-not-others/47396 "2024-05-17T13:55:40Z")
Hello, I have an RTK Express (firmware v4.0) which I am trying to supply Skylark correctional data to through SW Maps. My iPhone with the Express in Bluetooth BLE mode fails to do this and the NTRIP client repeatedly dis… --- ## [Issue with AT&T SIM Card Registration on SARA-R410M LTE Module](https://community.sparkfun.com/t/issue-with-at-t-sim-card-registration-on-sara-r410m-lte-module/47435)
**Author:** [@biswajit10](https://community.sparkfun.com/u/biswajit10)\ **Replies:** 2\ **Last updated:** [May 16, 2024, 11:44pm UTC](https://community.sparkfun.com/t/issue-with-at-t-sim-card-registration-on-sara-r410m-lte-module/47435 "2024-05-16T23:44:32Z")
I am currently utilizing the SparkFun LTE CAT M1/NB-IoT Shield - SARA-R4 for my research project. Until now, I have successfully used a Hologram SIM card with this module without any issues. However, I’ve recently encoun… --- ## [Modem Provisioning](https://community.sparkfun.com/t/modem-provisioning/47343)
**Author:** [@yuezhao](https://community.sparkfun.com/u/yuezhao)\ **Replies:** 4\ **Last updated:** [May 6, 2024, 6:35pm UTC](https://community.sparkfun.com/t/modem-provisioning/47343 "2024-05-06T18:35:27Z")
I have a RockBLOCK Mk2 - Iridium SatComm Module and wanted to add/activate it into our existing line with our company’s Iridium account. In order to do that, it is required with either commercial or government provisioni… --- ## [There is no real technical support for the nRF9160 Thing Plus.](https://community.sparkfun.com/t/there-is-no-real-technical-support-for-the-nrf9160-thing-plus/47266)
**Author:** [@Geocom](https://community.sparkfun.com/u/Geocom)\ **Replies:** 2\ **Last updated:** [April 29, 2024, 10:52pm UTC](https://community.sparkfun.com/t/there-is-no-real-technical-support-for-the-nrf9160-thing-plus/47266 "2024-04-29T22:52:35Z")
We need a cellular modem for our product, we chose a Sparkfun cellular modem evaluation board since it is a breakout board that contains only the components needed to function and includes Nordic Semiconductor’s fantasti… --- ## [communication problem with arduino Mega and SparkFun LTE CAT M1/NB-IoT Shield - SARA-R4](https://community.sparkfun.com/t/communication-problem-with-arduino-mega-and-sparkfun-lte-cat-m1-nb-iot-shield-sara-r4/47200)
**Author:** [@Elmotivator](https://community.sparkfun.com/u/Elmotivator)\ **Replies:** 1\ **Last updated:** [March 28, 2024, 9:54am UTC](https://community.sparkfun.com/t/communication-problem-with-arduino-mega-and-sparkfun-lte-cat-m1-nb-iot-shield-sara-r4/47200 "2024-03-28T09:54:13Z")
Hi all, The SparkFun LTE CAT M1/NB-IoT Shield - SARA-R4 run well with an Arduino uno but when I replace the arduino UNO by an Arduino MEGA using the “Sparkfun\_LTE\_Shield\_Arduino\_Library.h”, none given exemple works well… --- ## [FirstNet certified](https://community.sparkfun.com/t/firstnet-certified/47158)
**Author:** [@realtreyboothe](https://community.sparkfun.com/u/realtreyboothe)\ **Replies:** 1\ **Last updated:** [March 21, 2024, 5:43pm UTC](https://community.sparkfun.com/t/firstnet-certified/47158 "2024-03-21T17:43:24Z")
Hello everyone, I’m in search of an LTE module that is FirstNet certified and must utilize one of the approved modules listed below: Telit Cinterion MLP31-W Telit Cinterion PLS83-X / PLS83-X-B / PLS83-X2 / PLS83-X3 W… [Next page](https://community.sparkfun.com/c/wireless-iot/cellular/93.md?page=1)