07-30-2015, 04:37 PM
I thought iMessage required an Apple ID. Unless your wife's texts are blue, she's never been using iMessage. Perhaps your wife was sending regular SMS/MMS this whole time? If your wife uses her UK SIM to message you, there might be additional charges for the International rate.
From Apple:
"Go to Settings, tap Messages.
Turn on iMessage and tap “Use your Apple ID for iMessage.”
Note: iPhone screens shown. On an iPad and iPod touch, you won’t see the screen on the right, you’ll go straight to the Sign In screen below."
https://www.apple.com/ios/messages/
Edit: Never mind, from iMore:
"Prior to iOS 6, you could only use an Apple ID, aka an email address, in order to send iMessages from an iPad. If you're running iOS 6 or higher, you can link your phone number with your Apple ID and start message conversations on both iPhone and iPad with your phone number."
Your wife simply needed to associate the new phone number with Apple, right?
From Apple:
"Go to Settings, tap Messages.
Turn on iMessage and tap “Use your Apple ID for iMessage.”
Note: iPhone screens shown. On an iPad and iPod touch, you won’t see the screen on the right, you’ll go straight to the Sign In screen below."
https://www.apple.com/ios/messages/
Edit: Never mind, from iMore:
"Prior to iOS 6, you could only use an Apple ID, aka an email address, in order to send iMessages from an iPad. If you're running iOS 6 or higher, you can link your phone number with your Apple ID and start message conversations on both iPhone and iPad with your phone number."
Your wife simply needed to associate the new phone number with Apple, right?