Hello, I am from Argentina. I went to USA in january and I bought this cellphone (xt1060). The phone have been working fantastic with 4G/LTE until I updated to 212.166.3. No more 4G/LTE signal. And always lose signal on 2G/3G. I made all the things that i could do. Hard reset, wipe cache. Checked APN.
I dont know what it could be the problem! I also use my SIM in another phone and it works great 4G.
Help me! thanks.