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  • Can you please clarify what you mean by "old/new" ? Do you already have data about the users while they are going through the registration process ? Also, what is the Device ID and the SIM ID in this case ? Commented Jul 8, 2014 at 21:44
  • well, I'll try to clarify this in the question, but for now, the user may change his phone, & he should keep his data, so in this case he has a new Device Id that should be verified & so on Commented Jul 9, 2014 at 9:32
  • 1
    Users can actually change their phones (i.e. the terminal) and/or independently change their phone number. It looks like you need to have an unambiguous conduit to each user. A personal email address seems to be the standard adopted by many app providers for this purpose and it does not require any additional password. Commented Jul 9, 2014 at 10:31