Iphone 5 connecting to Wi-Fi

OK so my grandpa just got an iPhone 5 his Wi-Fi has a password on it so when he goes to connect to it it does bring up the option to type the password in so how do I get that?

Usually on the back of your modem, the password will be written on it, might be abbreviated as WPK
If not then it should be in the manual that came with the modem.

If you find it and it does not work then your uncle (or whoever owns it) may of changed the password so you'll have to ask him what it is.

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