Honor 10 does not work with AT&T prepaid

The Chinese version has only one of 2 required 3g bands.  If you don’t have access to a band 850 tower, you don’t have service.  

@karlpinto

Hate to be blunt, but it’s up to you to accommodate the service by bringing a compatible phone.   ATT, or any other carrier, is not going to run out and put out new frequencies because your phone won’t work.   Verizon will just flat out refuse to activate phones not on its list, even if it “should work”.  AT&T is more forgiving, but it cannot make an incompatible phone work.  

Since your roaming on the other sim, this might be a funtion of the dual sim standby (malfunction) 

You might remove second sim or swap SIM cards, but it’s usual for both slots to have same bands, so I can’t imagine a difference. 

Honor 10 from India (Mainland China version) do not work well with AT&T.

Thank you for your responses. Actually I have to say that it worked perfectly well for 6 days after which it suddenly started its "issues". Same place, same towers, same everything, except that it just stopped allowing me to make/receive calls suddenly. When customer service "reset" my account, it would work again absolutely perfectly, but only for that one day (24 hours). Somehow it fails to continue to the next day @ $2 a day. I have to call in again, they "reset" it or whatever and then it works again for the next 24 hours. For what its worth, AT&T Level-3 (?) support opened a support ticket/case for my complaint (Tkt no. CM20181106_137360804 dtd 06Nov2018), but unfortunately this has not been solved! I have thus had to purchase another phone from AT&T to utilize my plan!  

So, it seems to me that this has nothing to do with the requirement of the 3g bands on the phone. But instead the AT&T system somehow has suddenly "blacklisted" my Honor 10 phone (or IMEIs)? 

Thanks... K 

Blacklist isn’t the right word.  Having only one compatible band means the phone is at a huge disadvantage.  It’s not going to be able to switch towers for best connection.  I connect to a primary tower, but not unusual to get bounced to a different tower and back again. Power cycling the phone will force it to find a tower again.  This is what you can expect with this phone.  Att can’t accomodate, so you’ll have to replace the phone.  

Well, I respect your apparent confidence, but I am still convinced that there's a lot more to this. This is a dual sim phone. My second slot carries my Indian carrier sim card which roams here in the US. And it roams on the AT&T network, yes the same one! There is absolutely no problem with my India sim card working here on the AT&T network. So this is not as easy as the 3g bands explanation, sorry. But thanks for your concern anyway. This clearly is an AT&T problem and I'd encourage and request them to address it clearly if possible please. Thx... K