LTE-M1 uses less than one-tenth of the bandwidth of LTE and LTE-Cat 1. LTE has been designed to provide fast data transmission for smartphones and LTE is therefore leveraging large frequency bands of 20 Mhz. There are billions more of them, but they use a fraction of the available bandwidth that is physically available. In general, IoT devices use significantly less data than cell phones. This means that devices can easily switch to a different network in case there is no coverage in the specific location, providing better connection reliability. LTE Cat-1 simply has wider coverage because LTE CAT-1 is present everywhere that 4G/LTE is available and roaming is not limited. The greatest weakness of Low Power Wide Area Networks (LPWANs) like LTE-M and NB-IoT is that they currently are not deployed worldwide and NB-IoT especially has very few roaming options, which makes them less useful for global deployments than more established cellular technologies.
Poor / Medium - mostly western industrial countries LTE-M is an increasingly valuable connectivity option for IoT applications, but LTE Cat-1 has a couple of situational advantages over this newer technology. LTE Cat-M1 is the first version of LTE-M, or Long Term Evolution Machine Type Communication for low power devices.
Since they have similar names and the same purpose (adapting LTE technology to IoT), it would be easy to confuse LTE, LTE Cat-1 and LTE Cat-M1. Since it was built for the Internet of Things, Cat-1 also boasts longer idle times and sleep modes than higher tiers of LTE technology. This means LTE Cat-1 consumes less power and is less complex than higher LTE UE categories, making it better suited for battery-powered devices. The lower the category number, the slower its data speeds are. LTE has more than 20 distinct User Equipment (UE) categories that define specific uplink and downlink capabilities.
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