Real reason I learnt from people involved in the frequency attribution process is that allocation for the LTE 700 band was rushed to allow a quick cash grab during Hollande's presidency. I expect LTE on 700 will become a reality in other European countries as well, France is just early on this one. --- Double Post Merged, Jul 16, 2017, Original Post Date: Jul 16, 2017 --- As far as I know, GSM is only available on 900MHz and 1800Mhz. GSM(2G), WCDMA(3G) are capable of circuit switching. LTE(4G) is packet switching only. The first generations of LTE phones (before introduction of VoLTE) had to fallback to 3G (or 2G) to establish a voice call. My LG G2 works that way, the Pyra's modem will also work that way if you try a voice call. Modern devices on networks where VoLTE is deployed can have voice calls on LTE, using packet switching. As the Pyra is still not out but using already aging components, the modem is already outdated for French mobile networks. So it's your decision to choose the modem version (that will still work on 3G most probably at least) or to use a phone as a router.