Why am I receiving group texts so late?

I have an iPhone 4s and for the past two or three days I've been getting group chat texts hours late and they all come In at once. I use AT&T and all but it's weird cause I receive texts from people texting individualy but group texts just don't work. I've already checked my setting and stuff so I just need help trying to fix it

It could be the age of the sim card that happens when they are getting old, if it's not old you still need a new card, that one is faulty.

What did your carrier tell you?

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