Bypassing the free daily 50MB means that you can use as much as you want to without being restricted. All you need to bypass this cheat is ability to follow instructions..
To bypass the daily Opera Free 50MB, you have to switch on your data connection and launch the Opera Browser. After launching the browser you will be prompted to accept that you have been granted free 50MB data on MTN, just tap on I'm in" and start browsing.
make sure you browse until the normal 50MB gets exhausted.
Once you have exhausted the normal 50MB data and your browsing stops. Go to settings and select Applications, look for Opera Mini Browser and tap on clear cache and clear storage or data ( dependent on your android version).
When you are done clearing the data and cache. Switch off your data connection for some minutes and switch it back on again, then navigate to the Opera mini browser and immediately it starts reinstalling all the installation fils you will get another message informing you that you have free 50MB data to enjoy for the day. Once installation finishes, enter any web address you wish to access and start browsing again till it finishes.

COPY WITH CREDIT

CREDIT TO @meristicspdn