On a dual SIM android phone is there any setting whereby if one SIM is OFF the call or SMS sent by anyone to that number shall be diverted to other SIM? Two SIMs belong to 2 different service providers. And does it happen automatically just by some setting without any activation done at service provider end? I faced a weird issue in which when one SIM was OFF I was getting calls and SMS sent to that SIM on to the other number. I never availed any such service from the service provider knowingly nor there was any charge ever levied by service provider. I was told that this happened because some setting was enabled on phone that resulted into such call forwarding!! The only co-incidence is that I provided that other number as my alternate contact number to that SIM provider when that connection was taken and since then it started. Thx.