I would be glad to answer your questions about your data plan. Text and picture messages do not take away from your 2 gigabyte data plan. Sending and receiving pictures do use our data portion of the tower. That's why you may see a increase in the cellular network data. This is not charged against your monthly allotment.
Here's a great link to our data calculator: http://www.verizonwireless.com/b2c/explore/?page=data . This will give you an awesome tool to calculate your usage.
You can also check your usage by going to: www.verizonwireless.com/myverizon or by dialing #DATA then press send.
Please let me know if you have any other questions.
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