How to set up my voicemail on my iphone 4?

I've had my iPhone 4 for half a year already but I never got around to setting up my voicemail. Can anyone help me? I tried asking Google, which told me to go to phone, then the voicemail icon, the record a greeting. Well, I tried that, but when I tried saving it, I was waiting for like 10 minutes and it still hadnt saved! Any suggestions? Did i not wait long enough?

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