I have a ONIDA Mobile Phone Model No. F850 with Dual GSM facility. IMEI No. 357181020010812 Presently SIM1 is working properly but SIM2 is not working. In SIM2, massage display "Invilid SIM". I change the SIM1 & SIM2 but always SIM1 work. SIM2 invilid SIM. So What I will do? Please give suitable Suggestion
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