I have a Vodafone SIM and O2 SIM in mine.
If your phone is dual SIM you can go one better by changing one for an eSIM.
My arrangement is Slot 1, O2. Slot 2 Vodafone. Slot 2 also has a physical SIM on EE
1 and 2 can always be run together, but you have to choose which one is live in Slot 2 can't have Vodafone and EE at the same time.
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