Just wanted to chime in on this thread as I've been having this problem as well. All Apple devices send photos via iMessage just fine when connected to any other network, but more often than not will not send or receive images when we are using our home HughesNet system. Text messages go through, but images often fail. We have very weak cell service at our house - usually 1 bar LTE at best - and when we are lucky enough to get that weak LTE signal, we can send/receive images by disconnecting from WiFi. This has been going on intermittently for many months.
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