1. check yours dataplan offer like 79 ma 1gd 2g data etc.
you get in offer
after recharge yours offer you get 1gb 2g data but not get 3g speed
i'm slooving yours problem
10-20 minute use 2data like browsing and downloading after actived small 3g pack to yous phone like 11 ma 30 md 3g data you get 30 mb 3g data
note - not disconnect after 3g pake actived you get 1gb 3g data
>>>>>>>>>>>>>>BOSS<<<<<<<<<<
it's 100% working tested by me