Q: Do I need to be on wifi to pay for Apple Music with my iTunes funds

Hello Kf1058,

Thanks for using Apple Support Communities.

For any payments to be processed through either the iTunes Store or App Store, a data connection is required.  This can be either a Wi-Fi connection or your iPhone's cellular data connection.  If you're having issues with your Wi-Fi connection then I suggest taking a look at the link below.

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

Take care.