I can't receive SMS on GIONEE F800

Hi Garba, you need to check if your message box is filled up, you can delete unwanted messages on your phone to free up space, also, if you have incoming call barring, you will not be able to receive SMS. if the continue, you can contact MTN support.
You can contact MTN support via any of these channels:
1. MyMTN App
2. Facebook: @MTNLoaded
3. Instagram: @MTNNG
4. Live Chat: http://bit.ly/2OC5bHz
5. Email: customercareng@mtn.com
6 .WhatsApp: 09033000001