My Suggection is to make a Andriod smartphone with inbuilt virtual SIM card features but no SIM Card Slot.For this Phone We Make a Device Name (SIm Card Reader) By This we insert our SIM In SIM Card Reader And Connect TO Mobile Through OTG Cable And COpy All Data Using Software (All Data means Data Recquare for Connecting Sim To Mobile Operator Like VodaFone,Idea ,Airtel Etc to identify mobile Number) Into Virtual SIM of Mobile (this virtual SIM act as Real Sim for Mobile) and By This we...