The received text message shows that null has no theme. why

The received text message shows that null has no theme. This is because the mobile phone received the MMS, but failed to receive it successfully. Please check and solve the problem according to the following methods:

1. Mobile data function is not turned on: MMS can only be received if there is a network. Note that the network here is not a wireless network, but a data network. If the wireless network is turned on, just turn off the wireless network, then turn on the network connection and click Send.

2. The mobile phone is in arrears: if you are in arrears, you can't receive the MMS. Please recharge it.

3. Network delay or poor signal: Network delay will also lead to temporary inability to receive MMS. Turn on the flight mode for about 5 seconds and then turn it off, or connect to the network in another place and then receive it.