Originally Posted by Narsel
Two weeks ago I have bought used HTC One from AT&T. It was working ok for 2 weeks in Poland with 4G. Yesterday I rooted this phone with newest ARHD rom, and now I have only 3g data transfer and it is also slower than usual. When I was using stock rom I always had 4G or EDGE icon, and transfer was very fast (on 4G).
Anyone had this issue before?
Have you checked your preferred network type?
Dial *#*#4636#*#* to open the test menu, then tap on ''phone information'' and make sure ''preferred notwork type'' is set to ''GMS/WCDMA/LTE auto''
Also check your apn settings:
Settings ---> Mobile data ---> access point name ---> your carrier apn
Check that all values match your carrier apn. (you can found those values on your carrier website)