WARNING : Do not try the following if you are not a mobile device technician as you may damage you device in the process. To learn to repair mobile devices, please follow our online course here.
Mtn Smart s721i All Connection Way.
USB connection ways, SIM sit jumper way, speaker way, REC connection and battery terminal ways.
All connection are 100% working and reliable. Zoom image in to get a better view if the image is not clear enough.