IMessage not working with no service?

I have the IPhone 5 and I flew internationally and I connected to Wi-Fi since i have no service to text.before, it was working but then my iMessage wouldn't deliver so I turned my iMessage off and back on. Then it got rid of my phone number in the send and recive box, it's only showing up as my email and delivering my iMessages as my email. How can I get my number back to show up checked and send and recive on my phone number? Could it be cuz I have no sericve? When I fly back home do you think it'll show my number again?

It's because you have no service. When you fly home, your number should be showing so don't worry. To get your number to show without flying home, you'd have to call your service provider.

You can text with email address as identifier also, the text messages arrive the same.

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