Moving a team to Pay-As-You-Go changes how its real numbers are funded. The real number previously included for free becomes paid from its next billing window. Upgrading does not keep a permanent free-number allowance, and the team cannot switch back to Free.
Review the selected team and the number's billing window before treating a charge as unexpected. Testing numbers remain simulated. If a charge does not match the displayed usage, report the date, amount, and billing reference to support; do not delete the number to dispute it.