3G is not GSM, although many 3G modems are backward compatible (for now). GSM as such ended with 2.5G
The problem doing what you ask, is that the current modems generally support a number of 3G bands, but not all... so for example in Australia I have to deploy one version for Telstra, and Vodafone 2100, but a different modem chipset for Optus 2000/900 and Vodafone 850/900
It’s a real pain in the ass! I use SIM-5320x modems without issue.
Too bad the MKRGSM1400 is not on sale yet...Cause it's exactly what I was looking for (got ued to MKRFOX1200 and this boards seem handy to me)
The fact is I don't really need 3G or 4G, all I'm doing with this is IoT so basic short (several hundred byte) messages are to be sent every, for instance, 1 minute. GPRS would be fine for me.
I guess all those modules which are capable of 3G/4G variantes (LTE, HDSPA, etc) will be also capable of GPRS, right?