Hello! I am China Unicom 3G Apple 4. Why can I only send MMS messages to Apple mobile phone users but not to other mobile phones? It shows that the sending failed.

The iPhone cannot send MMS to non-iPhone users generally in the following situations:

1. You choose to use iMessage to send MMS. It is free to use iMessage to send Apple software under WIFI. , it only consumes data. At this time, it is not the SMS function of the operator but the function of the software, so it can only be sent to Apple users successfully.

2. If the normal sending of MMS fails, it is usually because the MMS picture is too large, the MMS format is incorrect, the network signal is poor, etc. When sending MMS, you need to confirm that the cellular network data is turned on and the MMS picture does not exceed 100K, formats that the MMS center can support: text formats containing Unicode characters and Chinese characters, audio media in AMR, MP3, SP-MIDI, AAC, and QCELP formats, files in GIF87, GIF89a, Jpeg, and WBMP formats, and files containing H.263 and MPEG4 video clips. At this time, it can only be received if the other party's mobile phone can support the MMS format you sent.