Why does my iPhone 12 drop the call while I’m texting another person

Hello emiyajima,

We're glad you thought to ask Apple Support Communities about the issue you're having with your iPhone dropping calls when trying to text with a different person. If you haven't already, restart your iPhone as restarting can resolve many odd issues: Restart your iPhone

We notice you recently reviewed the resource for being unable to make or receive calls. Were you able to complete those steps too? Here's that link again, just in case: If you can't make or receive calls on your iPhone

If the behavior remains, let us know more:

• Does this happen with anyone you text while on a call, or only certain contacts?
• Are you using cellular data only, Wi-Fi, or both?

The more details you can share the better.

Take care.