Hello, i'm right now trying to find an GSM module that can be used in USA. Currently I have an SIM800L that does not work with any of the phone companies in my area which are Tmobile and ATT&T. The GSM module simply won't connect to a network.
Does anyone know if there are any GSM modules that will work on ATT&T ot Tmobile? I'm not sure if it is because of the phone companies switching to 5G that theses modules won't work no longer.
2G (GSM and CDMA) which was state of the art in 1991, has been superseded by newer technologies. Afterwards you got GPRS (2.5G) and EDGE (2.75G) but those are getting extinct because the spectrum can be reused by more efficient 3G (UMTS / CDMA2000), and 4G(LTE) (which can use the same bandwidth to carry more data or serve more customers) and 5G networks
So the SIM800L stuff is just going to be very soon totally obsolete around the world, that's why you can find them so cheap...