wcdma not working only 2g work
My S4 I9515, phone is not connecting to 4g/3g, only connecting to 2g,
Its happened after - 1. change Imei (now not original Imei), because of country code
2. fall down 2 time
after one day of fall down, my mobile did not connect to 3g anymore . I checked every thing from setting.
What I did 1. reset factory setting.
2. software change 4.2 to 5.1 lolipop
3. change power cable
but still no working 4g or 3g,
please help me what should I do. technician also don't know. only say no repairing like this.
please tell me solution.