kiya ap main say koi jazz mbb welcome back offer istamal kar raha hai .main ye offer use kar raha ho masla ye hai k is k mb 3g par use hoty hain 4g select karo to signal nahi aty jab k device 4g hai sim bhe aur coverage bhe lte hai. bas puchna yahe tha k agar koi use kar raha hai to kiya 4g par net chal raha hai k nahi....