I was on the $30 1200 plan, i typically added $50 each month to cover the plan and data overage that I expected.
1200 minutes, 3k texts easily met my needs, and I was using 200-400mb of data.
Then I decided that was idiotic, and just bumped up to the 55 plan. I can care less how many minutes or texts i use or dont use, and the extra data is great. I'm ending the month with hundrends of MB's left over, and I stopped caring if I have wifi around all the time.
Disclaimer: If this is an answer to a TECHNICAL QUESTION, then MY ANSWER is correct, even if its contradicting something that a tech support rep, or anyone else said. I am not giving you the answer YOU WANT, I'll give you the answer I know is CORRECT.
If this is about CARRIER POLICY, then you should probably be aware that carriers change their policy unexpectedly, and inexplicably. Even if the answer is correct when posted, it could very well be wrong in a day, or week.