At&t no service when TMobile sim is set to use cellular data

[blackwarrant]

I have AT&T as sim1 and T-Mobile as sim2 on my Lumia 950 dual sim and had set my cellular data connection to use data from T-Mobile. Since Jan 6th my at&t sim wasn't connecting to the network ("no service"). I tired changing my cellular data to use at&t. That's when it started connecting to the at&t cellular network. But if I go back and change my cellular data to use tmo, my tmo network works but att sim says 'no service'!! Tried restarting my device multiple times. No use. Tried putting both my sims on an android dual sim phone, same behavior on that device too! That tells me that the issue is not with my Lumia. Any ideas on why my att sim says "no service" if I set my cellular data to use tmo?.

 

[xandros9]

By default, depending on the phone and OS, the secondary non-data SIM is locked to nothing higher than 2G. Which is no longer there in AT&T's case.

 

[Brendan Shurilla]

I had the same issue, January 6th AT&T shut off their 2g radios, thus ending support for the dual sim feature in the 950.. I even went to a windows store and swapped out phones, just to be sure. The only way to keep both working, is to keep cellular data on the AT&T sim.

 

[quek9]

I have been experiencing the same thing. Besides T-Mobile what other carrier has 2g coverage? How long will 2g be around? 2g sux, why limit the coverage to 2g? I hope that future dual sims will at least have 4g for both sims.

 

[nate0]

Re: At&t no service when TMobile sim is set to use cellular data

AT&T officially announced shutting down their 2G at the first of the year, but folks may have started noticing this before then or might notice more and more. They will re-purpose that equipment for 5G services. I've never had a need for the second sim slot on any of my devices, the the 950/xl can't use sim2 for 3G service...?

 

[Joe920]

Yeah, same problem with the Elite x3. I thought there were models where dual 3G was possible. Maybe the Idol?

Edit: correction, apparently HP enabled dual 3G on the x3, see here.

 

[nate0]

Yeah, same problem with the Elite x3. I thought there were models where dual 3G was possible. Maybe the Idol?

The idol 4s was suspected to come dual sim, but as far as we know there is only a single sim model.

 

[Joe920]

The idol 4s was suspected to come dual sim, but as far as we know there is only a single sim model.

Turns out I was wrong, the x3 now does this: http://forums.windowscentral.com/mi...0-dual-sim-t-no-more-2nd-sim.html#post3622567

 

[nate0]

Turns out I was wrong, the x3 now does this: http://forums.windowscentral.com/mi...0-dual-sim-t-no-more-2nd-sim.html#post3622567

Is it so that all Windows Mobile Dual sim phones lock on to 2G for the 2nd sim slot? Why?