Can't send text to non IPhones

My boyfriend has a Samsun phone, and I have an iPhone. It's never been a problem till now my messages won't send to ANYONE that doesn't have an iPhone. He's loving the country for a whole and we will need to keep in though besides calling. What should I do I've tryied restarting the network settings, turning iMessage off and on and so on and so on. I need help!

You probably have no credits. Contact your provider.

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