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Has this been revealed? I have not been able to find it.

I would like the option of unlimited once my contract is up and I go month to month
 
Yes, nothing changes.
You dont need to be under contract to maintain your data plan.
As long as you dont change it to the $15 or $25 they will not take it from you.
Once you do change it or cancell your account or start a new one you wont be able to put it back again.
 
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