Why can't OPPO R9s receive MMS?

The reason why the mobile phone failed to receive the new multimedia message: 1. Confirm whether the data network is open; 2. The network signal in the environment is poor, and there is no signal. It is recommended to download and observe in another network environment; 3. Replace SIM card to receive and download MMS for observation; 4. Back up mobile phone data (phone number, SMS, photos, etc.). ), restore the factory settings of the mobile phone or brush the machine to solve it; None of the above methods can solve it. Please back up your mobile phone information and bring your mobile phone purchase invoice, warranty card and mobile phone to the nearest OPPO customer service center for testing and processing.