It seems some lesser-known companies are reaping the rewards since AT&T said it would shut down its CallVantage VoIP service in October.VoicePulse says it’s seen a 33 percent increase in new residential customer sign-ups since AT&T’s most recent announcement that service would end on October 20.VoicePulse lets you keep your phone number at no additional cost. Local Unlimited and America ... (77 words)

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