ipad: My phone number is "Unavailable for sign-in"

Ensure that you have explicitly enabled Text Message Forwarding for your new iPad on your iPhone...

On your iPhone:

Settings > Messages > Text Message Forwarding - set to ON - and explicitly enable your new iPad from the list of devices.

Also ensure that Messages in iCloud is enabled on both your iPhone and new iPad:

Settings > [Your Name / AppleID] > Messages - set to ON

You may also need to check your WiFi Calling settings on both your iPad an iPhone:

Make a call with Wi-Fi Calling - Apple Support

Hey everyone, new iOS update fixes it.

My phone and ipad are doing/saying the same thing. My phone is acting strange. Calls I miss are being forwarded to another family member. Also iMessage is sending replies I send in group messages individually not,keeping them in the group thread. So weird…..just started happening about 2 weeks ago.

I tried the 2 suggestions from LotusPilot and that didn’t work.

Seeing the same thing here on my iphone SE 2nd gen.

Switched carriers and CANNOT get the "Unavailable for sign-in" to go away after extensive troubleshooting. Causing inconsistency with imesssage across my devices.

Tried

1) turning iMessage and Facetime off/on and rebooting iphone

2) Changing appleID password, signing out/in

3) Backing up iphone and restoring iphone

Same issue here too.

I have the same issue on both my iPhone and iPad. not sure what could be the problem and it all started when i updated to the latest ios on both devices and increased my icloud from 200gb to 2TB.

I just updated from 200gb to 2TB also. Hmmmmm?

I tried all 3 of these also. Didn’t fix problem. Could it be a TMobile thing? That is who I use