Overage Fees - Upgrade Plan and then change back for only $20 - and no change to contract?

Question

I am on the Nationwide 700 minute family plan with two lines and finally on a month to month contract.  Just saw on my account that I am over my allowance by 67 minutes ($30.15) and I still have five days until my billing cycle ends.  
I called VzWireless and the lady on the phone said that there is a way to minimize the overage expense this one time.  According to her, if I "upgrade" my voice plan to the 1400 minute plan before the 21st of the month I will end up not having to pay any overage fees on the peak hours (at least $30 as of writing this with five days to go) and would only have to pay the difference in plans which works out to be an extra $20.  She also said she could "future date" an order to move my plan back to my normal 700 minutes after the bill is issued on the 21st so that I would not have to maintain the more expensive plan.
Frankly, this sounds too good to be true -  I mean why wouldn't every Tom, Dick, and Harry that goes over on their minutes do this then?  Maybe I am the only person who has not figured this out?  The whole reason I am over on minutes this month is because I got caught in a Directv/U-Verse teaser scam and had to call each company's customer support lines and ended up on hold for hours!  Needless to say I am skeptical...
Is there any merit to this?  Is it true that I can change my plan without renewing to another two year contract?  Are there hidden fees? Can I trust Verizon?  

Answer 1

Yes, this is true.
You can change your plan to the 1400 minute plan prior to the end of your billing cycle. Just make sure that this change is "backdated" to the beginning of the billing cycle you are currently in, so that you have those 1400 minutes available to you for this entire cycle. You will then not go over your allowance.
After your current billing cycle ends, you can change your minute plan back to the 700 min plan.
I don't know if I would want the CS rep to do both changes at the same time, as this leads to more likely of a mixup which may impact you in a negative way. Might be better to do one at a time.
Edit: This practice has been around for awhile. Unlike you, several people who have this service pointed out just like to complain that Verizon should just do this without being asked so that they would never incur overages. Those same people would then just complain that their bill increased without them giving permission to increase their minute allowance.