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Slydial is easy to explain: You sign up, then dial 267-SLYDIAL from any cellphone or land line. Enter the phone number whose voicemail you want — cell phones only — and Slydial lets you record and leave a voicemail message without ringing the other party's phone first. I can finally do my Leonard Cohen impression into my wife's inbox without disrupting her board meetings. Slydial limits you to one phone number per message. That's good — let the telemarketers dial us one at a time.