One plus 5 has 4g volte network. So it shoud be more prefferable than others. It’s supports 4g in dual sim slot. It suppots hspa/gsm/cdma also.
HSPA, LTE-A( 3CA) CAT 12 600/150 MBPs
There are many more customer servises among all cities. So customers are not dissapointed about the servises of the company.