Open the phone settings → "SIM Card Manager" .
Check both SIM are active on device .
From Data service network choose SIM 1 or SIM 2 for data connection (My case i will be using SIM 2 for data connection).
To decide which SIM to use to send self-registration SMS in order to register PGSM with the number desired from drop down menu select SIM 1 or SIM 2.
Open PGSM and start step by step for the automatic activation Wizard.