H2O Pin credit must be H2O wireless subscriber to use this pin comes in paper printed. Instruction is included with printed materiel come in two page.  The pin is about 12/15 digit long we can credit directly or follow steps below. instruction how to credit on your own:  Call toll free at 1-800-643-4926 ·Enter Prepaid Mobile phone number ·Press 1 to add money to your account ·Enter your PIN ·Dial *888* ·Enter your PIN followed by the #sign and SEND Customer Serv