I got Sparkfun lte cat m1/nb-iot shield and followed Example 00_Register operator. It worked and Blue LED was on but SMS is not receiving. So I turned off and start again. It keeps showing Error connecting to the operator.
19:49:29.907 → Initializing the LTE Shield…
19:49:29.907 → …this may take ~25 seconds if the shield is off.
19:49:29.907 → …it may take ~5 seconds if it just turned on.
19:49:30.760 → LTE Shield connected!
19:49:30.794 →
19:49:30.794 → Setting mobile-network operator
19:49:30.828 → Set mobile network operator to Default
19:49:30.862 →
19:49:30.862 → Setting APN…
19:49:30.896 → APN successfully set.
19:49:30.930 →
19:49:30.930 → Press any key scan for networks…
19:49:33.820 → Scanning for operators…this may take up to 3 minutes
19:49:33.854 →
19:51:16.697 → Found 3 operators:
19:51:16.697 → 1: 505 02 (50502) - AVAILABLE
19:51:16.731 → 2: 505 03 (50503) - AVAILABLE
19:51:16.765 → 3: 505 01 (50501) - AVAILABLE
19:51:16.799 →
19:51:16.799 → Press 1-3 to select an operator.
19:51:27.372 → Connecting to option 1
19:54:27.632 → Error connecting to operator. Reset and try again, or try another network.
19:54:27.700 → Connection info:
19:54:27.734 → APN: hologram
19:54:27.768 → IP: 0.0.0.0
19:54:27.802 → RSSI: 16
19:54:27.836 →