WCDMA only – The GSM phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all. GSM auto (PRL) – The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more .
Read moreWhat is LTE GSM auto PRL?
Better option is LTE/ UMTS auto (PRL) . This refers that whenever your surrounding area has strength of 4G signal then it will run in LTE mode . If your area is surrounded by signals of 3G strength then it will run only in 3G mode. Thats all. Hope it helps!21 Şub 2017
Read more