Why is my iphone recieving texts late?

I'm texting my girlfriend and she gets my texts on time but when she sends back i don't get them for like 20 mins to an hour.imessage is working fine for me. My girlfriend does not have an iphone. But some other people i've been texting without iphones are replying and receiving my texts at a normal rate… Its getting annoying

Ask your girlfriend if her phone isn't texting well with other people besides you. If you can text others at a normal rate, then it isn't your phone.

That might be your girlfriend or urs servic provders problm

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