I bought this mobike phone 6months back, I thought it is very good phone but after using it I realised that there is 4g network problem with this phone. The 4g networks on this phone are really very weak. I am using airtel 4g services on this phone but it does not work properly. I am using airtel 4g services on redmi note 3 it works very well on that. I went to service centre they checked the phone and said there is no problem with phone, then I visited airtel store they also checked everything they said all is working fine.Then I thought to put same sim card in other phone and use 4g in the same place where it was giving problem and the result, it was working very well very fast. After that day I realised that the problem was with the redmi 3s only. Not with sim not with other phones. The redmi 3s phone 4g connectivity has problems with it. So I request everyone to read this genuine problem I had mentioned then plan to buy phone.