Preferred SIM problem

My FP3+ had two sons installed. SIM 1 is a Three Mobile on a monthly contract. SIM 2 is a Vodafone PAYG.

I like to keep SIM 1 as my preferred SIM for calls, data and texts but each time I restart my phone SIM 2 becomes the preferred SIM for calls. This problem has only occurred since upgrading to Android 11, I think.

Any ideas?

It’s interesting to note that my wife’s FP3 doesn’t have this problem. Her two SIMs are Three Mobile and Giffgaff.

Thanks in advance.


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Did you change the slots to see if it still happens? Or do some tests with your wifes SIM cards?

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There was a similar problem with the FP4, so maybe the solution is the same as well: Do both SIMs have PINs set or maybe only SIM2? In that case try to set PINs for both of them.

For reference:


Thanks for the hints.

I have sorted the problem by switching on the SIM PIN for the second SIM so that I have to use a PIN for each card when I restart the phone.

The Vodafone SIM had its original PIN. The default PIN is 0000 for Vodafone SIMs. I changed the PIN and switched on SIM card lock.

All is now well.


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