Power down the phone, then replace the old SIM card with a SIM from a different network. Check that the iPhone is able to connect a phone call over the new network. That’s the short version ...
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Which iPhone Models Support Dual SIM?only the iPhone 14, 15 and 16 models sold in the US are eSIM only. This means you cannot insert a nano-SIM card into these devices. However, you can have multiple eSIMs installed on these devices.
Here’s an outstanding hack that adds a dual SIM slot to a US-sold eSIM iPhone 15/15 Pro ... you can likely install this mod for yourself. Of course, you lose some things, like waterproofing ...
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