My bill is due soon but I can't pay it then is there a grace period
To our understanding, there is no longer a "grace period" with Metro. They do however have a bill float / extension option as discussed at length here.
The extension is only valid however after the account has already been suspended and up to a maximum of 2 days.
MetroPCS is a pay in advance service. Your bill is due on the same day every month If you forget to make a payment by your due date, your service will be temporarily suspended until a payment is made, if your service is suspended you can change your due date to a different date of the month.
This is a $5. bill cycle reset.