What is LTE-M
Quick definition
LTE-M (also LTE Cat-M1) is an LTE variant designed for IoT: moderate bandwidth (up to 1 Mbps), very low power, voice support, and real cell-to-cell mobility. It is the sweet spot between NB-IoT (cheaper but static) and Cat-1 (faster but power-hungry).
When to choose LTE-M
When your device moves (asset trackers, portable alarms, wearables) and needs little throughput but handover between cells. LTE-M supports 4G-style mobility; NB-IoT drops the session when it changes cell.
Real coverage in Spain
LTE-M has been deployed by Vodafone, Orange, and Movistar with national coverage since 2020. International: AT&T, Verizon, Deutsche Telekom, and most of the EU. Asia-Pacific coverage is patchier.
FAQ
Does LTE-M consume more than NB-IoT?+
Yes, slightly more, because it maintains mobility and handles more dynamic sessions. But with PSM and eDRX it can still last years on a C-cell battery.
Do I need a specific modem for LTE-M?+
Yes: Cat-M1 modems or multimode NB+M (Quectel BG95, u-blox SARA-R5, Nordic nRF9160). A vanilla Cat-1 modem will not do.
Related terms
What is NB-IoT
NB-IoT (Narrowband IoT) is a 4G/5G LPWA technology optimized for small messages from static, multi-year battery devices. It runs in a 200 kHz sub-band and prioritizes deep coverage and extreme power efficiency over throughput.
What is LTE Cat-1
LTE Cat-1 is the LTE device category targeted at general-purpose IoT: up to 10 Mbps down, 5 Mbps up, voice support, and works on any 4G network worldwide. Its Cat-1 bis variant runs on a single antenna, cutting hardware cost. It is the workhorse behind POS terminals, alarms, gateways, and low-bitrate CCTV.
What are PSM and eDRX
PSM (Power Saving Mode) and eDRX (extended Discontinuous Reception) are 3GPP-defined mechanisms that let a cellular IoT device draw microamps while idle. PSM turns the modem off between long windows (up to days); eDRX spaces paging listening in short intervals (seconds to minutes) without losing network registration.