iPhone doesn't get my texts

So I recently got a new phone, and one of my friends unblocked me on their iPhone. When trying to text her, she gets none of my messages, but she can text me fine. I have used Go SMS, as well as the stock texting app from my phone, neither works. She is sure that she unblocked me. Is their any solutions I can try on my end, such as network settings? I am on Metro PCS with a Zenfone 2.

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