MMS issues while working on Nokia Lumina 800, how to send and receive MMS

The audio MMS works fine with my Windows powered phone Nokia Lumina 800. But I am not able to send videos through MMS. Can you please help in solving this problem?

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Solution:As per my search it is best so you can try
It seems the network setup is available again.

zune://navigate?phoneAppID=b95840dc-a542-42a6-bee4-7d1a12f62d2c

Your phone need to have the latest 7740 update.
Delete any manually added APN settings and restart phone.

I can finally send MMS from my Lumia.

(or)


In the diagnostics app you have the option to set mms settings under "APN settings" make sure you have the latest software installed and dial ##634# in the dial pad to get the diagnostics app &
as per my view it will be done

HEY GUEST...

Here come the solution of your query.

You would just need to download Nokia Network Setup app to change your MMS settings, as that can only be done through a third party app in Windows Phone.
However, Nokia has removed the app from the marketplace and from its NOKIA APP Store as well.

If you are just starting with AT&T, i.e. porting your number from another carrier, it is possible that the porting process wasn't quite complete. Wait for a day or two and your MMS should start working.

If not, then you must contact with your service provider as they help you setup your Internet Configuration either mannually or automatically.
Only then you can access to send and receive MMS.

Hope this helps.

Thanks
Regards Libin