Hi @Bhavya, 

welcome to our English Community. Nice to meet you here. 

Thanks for your message. Of course, you have the possibility to get extra data-volume. Just have a look here: o2 Packs Our data-packs are always valid for one month and can be cancelled each month. 

You have also the possibility to prolong your contract for further 24 months and to change your tariff into one that has more data-volume. You can prolong your contract online. 

If you need further help, just let us know. 

Loving greetings,

Tobias