Tracfone airtime card includes minutes stated on the card, texts, and 30MB of data. The Android phones have better software to use the web and 30 MB will not go very far.
Tracfone has introduced Data Cards that are purchased separately and increase Data from 30 MB to available amounts. You can choose 300 MB for $10, 750 MB for $20, and 2GB for $50. Data Card purchases will not add airtime minute nor texting, can not be used to activate a new Tracfone, and will not extend your service date. Once added to your account the data is yours to use whenever you like and will rollover as long as you keep your service active.