yep. i've done it a bunch of times, not as much as i could have. only on personal accounts b/c bus. is $65 not $25. you downgrade on the phone, upgrade online. i even got the fee waived a few times b/c they already charged for the year.
"i mean, i downgraded cause i thought they would refund the fee but they didn't, so i upgraded again, but now they just charged me again! just downgrade it please and waive the fees."