This is a test of commonsense. Complete the next sentence:

How to use a pay phone
Carry enough coins for a phone call.
Some pay phones-especially those in airports and train stations-also accept credit cards these days, but the charges for those can be extra high. Make sure you read the cost on the machine before paying.
Buy a small pack of wet wipes and gently wipe over the phone. You don't know who has used it before you.