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When certain callers — often businesses on older landline or office phone systems — can’t reach your number and hear “the call cannot be completed as dialed,” the most common fix is on the caller’s side: have them dial the full number.

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Ask the caller to dial 1 plus the area code

Many older office systems still dial 7 digits. Most U.S. areas now require the full 10-digit number, and some require 1 first. Ask the caller to dial 1 + area code + the 7-digit number. This resolves it more often than you’d expect.
If 11-digit dialing works where 7-digit dialing failed, the caller’s phone system needs a dialing-plan update. Only their phone vendor can make that change.
Contact support if cell phones reach your number fine but multiple landline callers still can’t get through after dialing the full number, so we can check for a carrier-level block on the calling side.