APN is not saved by default.
I have to change preferred network to GSM/WDCMA Auto.
I get an error that Unfortunately, the process com.android.phone has stopped.
But the APN now gets installed of both the sims.
In dual sim settings the 2nd sim is activated by default for calls, data & messaging.
Now when I restart my phone due to any reason I have to go through the entire process stated above to get APN.
Also when I get a 2nd call in call waiting the 1st call goes to HOLD automatically.