The B311-221 lacks 5 GHz Wi-Fi and carrier aggregation (Cat 6+). If you need faster speeds, consider the B535 or B818.
The most common and safest method to unlock this device is by using an official IMEI-based unlock code
The B311-221 lacks 5 GHz Wi-Fi and carrier aggregation (Cat 6+). If you need faster speeds, consider the B535 or B818.
The most common and safest method to unlock this device is by using an official IMEI-based unlock code