You can switch phone numbers before you make a call using these steps:
You can only have 10 eSIM profiles stored on your device at a time. Tap the plan you want to use, then tap Turn On This Line.Tap Settings > Cellular > Cellular Plans.To switch which eSIM is active, follow these steps: iPhone 13 series: You can store more than one eSIM in your iPhone, and have two active eSIMs or one active nano-SIM and one active eSIM at a time.
If you're asked to enter a confirmation code to activate the eSIM, enter the number provided with the QR code.Tap Continue, at the bottom of the screen.When the Cellular Plan Detected notification appears, tap it.Open the Camera app and scan your QR code.
If your eSIM doesn’t automatically download or you need to recover it, follow these steps: On the current iPhone, tap Transfer. If you get any errors, check out the troubleshooting page.Choose the eSIM to transfer from the list, then tap Add Cellular Plan.Use these steps if you skipped that part of the setup: You'll be prompted to transfer your eSIM when you're setting up your iPhone for the first time. Remove the physical SIM from your old iPhone.If you get any errors, check out the troubleshooting page. Tap Convert Cellular Plan > Convert to eSIM > OK.If it doesn't show, you can manually change the SIM to the iPhone's EID. Select your phone number that's connected to the physical SIM.On the new iPhone, tap Settings > Cellular > Add Cellular Plan.Make sure your current iPhone is powered on, has the physical SIM inserted, and is next to your new iPhone.Make sure both iPhones are set up and logged into the same iCloud account.You can use your two iPhones to transfer your physical SIM to an eSIM with these steps: Transfer your physical SIM to eSIM with another iPhone T-Mobile Prepaid customers must download and use the T-Mobile Prepaid eSIM app.
For most Postpaid T-Mobile customers, when you change the SIM to the iPhone's EID, you're automatically prompted to install the assigned cellular plan.Choose which number to use for cellular data.Choose which number to use for a message.Choose your default line for voice, messages, and data.Transfer your physical SIM to eSIM with another iPhone.