I had data off until 7 hours after new billing cycle kicked it, and you know what? I received a message instantly telling me that they had charged me $20... I am sure I still had 5-10mb data to 250mb. I also saw lots of 2MB usage of data. Why I happened to used 2MB each time?
FreedomPop always (or at least usually?) tabulates data in 2mb chunks. If you use 21mb in one session, it will show 10 x 2mb data charges, and 1 x 1mb data charge.
Beyond that, I don't know the specifics. I have noticed that FreedomPop's exact plan turn-over times don't seem terribly predictable. I usually set my phone to limit data at 200mb, leaving a cushion for possible differences in calculation between my phone and FP's recorded data usage.
Also, it might be good to have an app that earns and/or restricts your data usage. I have My data Manager installed. I set it to 230 Mb limit every time i swap an FP SIM card.
At least as far as I can tell on my Freedompop accounts, it is no longer possible to disable auto topup without enabling Safety Mode for $6.99/mo, no matter how much top-up credit I have.
I've been meaning to switch the accounts I still use over to billing on virtual cards that will result in a billing issue instead of a charge if they try to top me up from them, just in case I ever forget to reactivate my top-up credit quickly enough when it expires. Maybe I'll take care of that tonight.
Unless something has changed lately, I believe scriptninja is correct-- it hasn't been possible to disable auto-topup without a monthly charge for quite some time.
Prior to the Red Pocket takeover, FreedomPop also did a pretty good job of ruling out virtual and prepaid cards. I don't know if that has changed, and would love to hear a report otherwise. The last workaround I read of involved setting Paypal for payment, and disabling recurring payments within Paypal for a specific vendor..
I try to keep android data limits set low enough to protect me. It's not foolproof.
As for using virtual card numbers, FreedomPop has rejected my attempts at using those cards. I have Citibank virtual cards, and Privacy.com virtual cards. Both rejected, after several attempts at different numbers.
Yep, they got picky with those. In a way, I can understand but considering the strangeness that many people report as far as billing, well - I'd say best to be cautious.