Why can’t I reply to one friend after switching from iPhone to Android?
I switched from an iPhone to a Galaxy Z Flip 7 a few months ago, and everything worked normally until recently. One friend can still send messages to…
SMS troubleshooting
Why Does a Correct Phone Number Show as Invalid When I Text It?
I wrote down someone's phone number and tried texting them, but my phone immediately said the number was invalid. I double-checked the number with the person, and they…