Why isn't my groupchat working?

I have an iPhone 7 and I have a groupchat with 2 of my friends, of which one of them have an Android. It usually takes a while for me to send pics, but yesterday I all together stopped receiving texts from the groupchat. (They texted me while right next to me). I tried shutting off my phone multiple times and I still don't get the texts. But, both friends individually texted me and I got them. What is wrong with my phone?

It's an overpriced piece of Chinese junk. That's what's wrong with it.

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