How to tell if someone got your imessage? - 1

I sent my friend a text and my friend replied then i replied asking a question and i got no reply

it was on imessage we both have the iphone 4 and it says delivered my friend doesn't have read receipts on but i do but my phones pretty messed up it restarts itself while i'm using it or it freezes or sometimes when someone text me i won't get it or when i text someone i won't get it and sometimes i get calls from strangers saying I've called them when i haven't

one of my friends wasn't receiving my text and i did check her phone she had none even when someone text me sometimes i won't get it for and then it just pops up on my phone saying i received it 20 minutes ago and this happens when i'm texting someon that doesn't have an iPhone

so what do you think did my friend reply or did my phone not send it or did his phone not get it?

You can't rely 100% on your phone, sometimes it tells the other party that it is ringing while you get no calls at all.

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