Will the airtime voucher from 7-11 expire? | Buy / Sell / Trade | Consumer forum

I don't have 7-11s in my local area and i plan to get the phone from elsewhere and switch the area code to mine thru customer service.

The problem I'd have is that i can't get airtime voucher since there aint a store around and adding value online is not an option.

So I'm thinking of getting some vouchers from a store whenever i get to the city with 7-11s. My question is whether these vouchers would expire (before using them, not talking about the 365-day period after you've added the voucher to the phone)

thanks