Her phone is having two issues:
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Texts from other phones are received several hours after they were sent when she’s away from home, texts that she sends always go through instantly. If she’s at home, she always gets texts instantly.
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Her phone keeps coming up as “offline” on some other phones.
As I stated in the title, I’m not familiar with phones, so I have no idea where to even start with this. I have done nothing more than a google search that didn’t give me any results relevant to the issues.
Yeah, that would make sense. You can try to verify it with a different sim card or contact your provider directly.