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I am using udp socket in my application. My application has been working since iOS 6 via WiFi or LET. Also, I am not use broadcasting and multi-casting. However my application can send/receive udp packets on iOS 14 via WiFi, but when I set LET instead of WiFi, the application can not send udp packets. The testing network provider is SPRINT. I am not sure iOS14 blocks udp packets via LET or SPRINT blocks udp packets. I have a server and I can check the udp packets transaction. So, when the application can not send udp packets via LET. Because the server dose not show udp packets transaction. However when the iOS device sets WiFi, the application can send udp packets.