If iMessage stopped working after a SIM swap, eSIM install, or port to MyBundle Mobile, the most common cause is that your phone number was de-selected in iMessage settings when the SIM changed.
How to fix it
• Open Settings → Messages on your iPhone.
• Tap Send & Receive.
• Under "You can be reached by iMessage at", make sure your new MyBundle Mobile phone number is checked.
• If your number isn't listed, sign out of your Apple ID at the bottom of the same screen, wait a minute, then sign back in. Your number should appear.
If iMessage still isn't working
• Confirm your line has data or Wi-Fi — iMessage requires an internet connection.
• Turn iMessage off and back on at Settings → Messages → iMessage.
• Reboot your phone.
If none of those resolve it, contact us.