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@Hook and I, both residents in East Coast, mid-Atlantic states, have spent time extensively testing the calling issues with the Pro1x in the United States. Our testing number is: 408-647-4636 The test center allows you to record/play messages and will also test your connection by immediately playing back your voice. It appears the news is not good. The only successful US network for Pro1x calling is GSM. Any other choice (eg: LTE, VoLTE) will result in call failure—no connection, dropped call, or inability to hear caller. This failure is persistent. In T-Mobile’s Preferred Netwo

Dear @Hook and @jakfish, Thanks for sharing the outcome of your investigations. It is intriguing that you get better results with GSM telephony. With my German carrier (O2), I have never been able to place or receive a call on GSM. Only VoLTE will work in the few places where the underlying LTE connection can actually be established. Note that this is not a restriction of my provider: I use and prefer GSM for calls all the time with the Pro1. What is different in our two cases is that US T-Mobile uses the 1.9 GHz band for GSM, while my O2 Germany relies on 900 MHz for that. Also, I o

Just a note. If it is true that the Pro1x can't use VoLTE, either because of hardware or software, there is more to it than that because my phone is not useless (at least until April 2024). It works. One difference between my phone and @jakfish's seems to be that mine, as I said above, stays on LTE Band 4 while his seems to switch bands. As I have also said before, if I weren't on a forum, I'd think I had a fantastic phone with nothing to be concerned about. I am not knowlegable about this stuff, but I hope our observations have some clues.

I merged another thread here to keep information in one place...

I agree: it's not ideal. I don't think the developers have abandoned the project, the rub is that fxtec have very little resources in the US, so they don't seem to be able to reproduce the problem. I don't know why, I've read posts from Europe complaining about the same thing. And why fxtec didn't fly one employee to the US with a handful of SIM cards and a rental car to drive and test across the country is beyond me, considering the size of the market here. Do try the GSM only setting in Preferred Networks--with wifi calling disabled--just to see if that improves call reception.

Hallo F(x)tec Pro1 community, it has been awhile since I last posted, and my Pro1 was lying somewhere in a box. Now I tried it again, but the issue remains. See below: Well, I dropped the fully working phone into water. At the end, display is dark, but everything else is still working (as far as I can tell). The phone is charging, switching on, LED is doing its LED thing, keyboard is backlit, phone is connecting, I can connect via computer and did download all my stuff. When I remember correctly, also wireless connection worked, but it's difficult to tell after all this time... but