http://www.ilounge.com/index.php/articles/comments/imessage-vs-smsmms-messaging-and-text-data-plans/To put this into perspective, a typical single iMessage will usually use about 1-2 kilobytes, or about 1000-2000 bytes of data, depending on how much text youre sending. By comparison, the smallest shared data plan available on Verizon right now is 1 GB per month, which translates to roughly one billion bytes of information. This would allow you to send an impossible number of iMessages per monthbetween 500,000 and 1,000,000before you would even get close to your data plan. Even if youre still on one of the older 150MB or 200MB data plans, this still equates to well over 100,000 iMessagesthats over two iMessages per minute, every minute of every day for an entire month. A more typical text messaging user may send about 1,000 texts per month, which would only eat up about 1-2MB of your data plan.
Read more at http://www.ilounge.com/index.php/ar...ging-and-text-data-plans/#Zv127qkYeUAuEx2L.99