Pay As You Go Questions

I'm looking at possibly switching pre-paid wireless service to Boost Mobile's Pay As You Go plan. I know from Boost Mobile's site that calls are 10 cents a minute and that I need to add more money at least every 90 days to keep the account active. The part I don't understand is whether or not the existing money carries over along with the Re-Boost money added? Also, what is the minimum amount you can put into the account? Thanks.

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I'm pretty sure when you reboost, it resets the 3 months. I think you can put $5 down or $10 for the lowest amount. I usually just put down $30 to $50, but I don't use the phone that much, so instead of having to pay the $50 each month, I've got 3 months to use it.
Ringtones will get you though, at $3.00 a pop.