I want to get more data usage on my iPhone or iPad for free...

To make your data usage up to five times more efficient on your iPhone or iPad, try using an app like - Onavo

If you like the idea of saving money on your mobile data plan, try using one of the text free services available like Nimbuzz, WhatsApp, GroupMe or Viber

Reference Article "12 Tips to Cut Your Cell Phone Bill" Article by Liane Cassavoy