There’s a code like this for your phone and you have to put that code on your phone so you get 24h free data from the internet. This means you can download as much as you want and for how long you want. The code changes each month. Some networks don’t work.

April Codes

*#1#543282#250305030503050302050502020303040405065050404030506054#

MSISDN shows that it worked.