How to change my voice mail from Spanish to English?

I have a iPhone 4S & my son was playing with my phone and I went to check my voice mail and I guess he changed it to Spanish! Can anybody help me on changing it back?!

Don't know if they moved the settings in the newer ios, but in the old versions, in Settings (in Spanish, Ajustes), Select General (same duh!), select International (Internacional), select Language (idioma), select English. It will take a bit, but the phone will redo the menus to English.