Cancel texting package?

keep in mind iMessage only works with other IOS devices, you cannot
send messages to non Apple products.

 

iMessage uses a relatively small amount of data, and it is unsure exactly how much it uses, as it depends on how much you text. With the 200mb plan, without sending pictures or video, should be fine within reason. Try to connect to Wi-Fi whenever you can.

Keep in mind that iMessage is limited to Apple devices and without a carrier text messaging plan you will be charged for text messages that you receive from non Apple mobile devices.

 

As long as you don't use data for anything else, you should be fine.

 

Straight texting with iMessage shouldn't use much data at all. If you are using iMessage to send pictures and videos then you will run out of 200 MB quickly.
Google voice is also a good option for sending text messages to people that do not have iPhones.

 

http://www.ilounge.com/index.php/articles/comments/imessage-vs-smsmms-messaging-and-text-data-plans/