My phone won't send an iMessage to a person with another iPhone when it used to?

Ok so me and this person text and we rely off iMessage cuz we both live over seas and iMessage used to be fine for both of us but now for her phone it keeps sending texts and it's costing me a lot of money. I have all my settings on and stuff and I can send iMessages to other people but to her it keeps sending them as a text when me and her clearly can iMessage cuz we both have iPhones. I don't know what to do and it's costing a ton of money for me, and prolly her!

Take this to your service provider, it sounds unusual and something you probably shouldn't waste time figuring out yourself.

She might have turned iMessage off, or maybe she switched phones without telling you.

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