If you own a device showing this string in its debug output:
Even “new” units can have quirks:
Problem: Module only connects at 3 MHz bandwidth.
Fix: The tower is congested. Force 5 MHz: AT+QCFG="band",0,0,80 (example for Quectel). 4g lte 5m h43 c50 mv2227 new
Problem: MV2227 batch has GPS issues.
Fix: Known bug in early 2022 batches – update to C51 firmware via proprietary flasher. If you own a device showing this string
Problem: High ping (120 ms+) despite good signal.
Fix: Disable eDRX (extended discontinuous reception): AT+CEDRXS=0. bandwidth options include 1.4
5m stands for 5 MHz channel bandwidth. In LTE, bandwidth options include 1.4, 3, 5, 10, 15, and 20 MHz. A 5 MHz carrier provides: