A customer says your phone went straight to voicemail. Your phone says nothing happened: no ring, no missed call, no notification. That combination is a useful clue, because it narrows the cause. Run the six tests below in order. They take about ten minutes together, and most business-phone voicemail problems turn up in the first three.

The example is Kerry, who runs Sunbeam Appliance Repair in Fresno with her cell phone as the business line. On a Tuesday three customers told her they only got voicemail. Her phone showed no missed calls at all. What she found is near the end, and it is the most common cause of exactly that symptom.

First: is it the phone or the caller?

Look at your call history for the time the customer says they called. Two cases:

  • The call is in your Recents, marked missed, but you never heard it. Your phone received the call and silenced it. The cause is a setting: Focus, Do Not Disturb, silenced unknown callers, a blocked number, or a ringer turned down.
  • There is no trace of the call. Your phone never saw it. The cause is further upstream: forwarding, no signal, a closed app, a number that moved, or the carrier.

Ask the customer two things: what time they called, and whether it rang before voicemail picked up. "It rang four times" and "it went straight to voicemail" point to different problems, as the next test shows.

Test 1: call it from a second phone and count rings (1 minute)

Use any other phone, ideally on a different carrier. Call your number and count the rings out loud.

  • Four to six rings, then voicemail: normal. The phone rang and nobody answered. If you were not near it, nothing is broken.
  • Zero or one ring, then voicemail: the call never reached your phone, or it was rejected. Go to tests 2, 3 and 4.
  • A busy tone, a fast busy, or a recording that says the number is not in service: the problem is the number or the carrier. Skip to tests 5 and 6.

Test 2: Focus, Do Not Disturb and silenced callers (2 minutes)

On an iPhone, check Focus in Control Center, then Settings, Phone, Silence Unknown Callers. If that is on, any number not in your contacts or recent calls goes quietly to voicemail, which is exactly where new customers live. Also open Settings, Phone, Blocked Contacts and look for a customer's number. On Android, check Do Not Disturb and the Phone app's block and call-screening settings. For a business number, "Silence Unknown Callers" is usually the setting to turn off. The cost of a new customer going to voicemail is higher than the cost of a spam call ringing.

Test 3: forwarding that was left on (1 minute)

Call forwarding is the top cause when the phone shows nothing. On iPhone, Settings, Phone, Call Forwarding shows whether it is on, with some carriers. On most GSM-style carriers (AT&T, T-Mobile and others), you can also dial *#21# and press call. A screen shows whether all calls are forwarded and to what number. The codes *#61#, *#62# and *#67# show forwarding when you do not answer, when unreachable, and when busy. Dialing ##002# turns all forwarding off. Verizon uses *73 to cancel forwarding. Codes vary by carrier, so if a code does nothing, ask the carrier.

Check the number it forwards to. A forward to an old line, a retired Google Voice number, or a coworker who left is the usual find.

Test 4: signal, battery limits and calling apps (2 minutes)

A phone with no signal, in airplane mode, or off sends calls to voicemail immediately, and some carriers do not log a missed call. Toggle airplane mode for ten seconds and call again from the second phone.

If your business number runs through an app such as Google Voice or a business phone service, open the app. Calling apps need to be running or reachable by notification. On Android, battery optimization can stop them in the background: set the app to unrestricted battery use and check that notifications are allowed. On iPhone, check that notifications and background refresh are on for the app. An app you have not opened in a week is a common reason calls "vanish."

Test 5: a number that changed or moved (2 minutes)

Think back over the last month. Did you switch carriers or plans, get a new phone, change SIM cards or move to an eSIM, port the number, or move it to a VoIP service? A port in progress, or a number whose records did not fully move, can leave some callers going to the old carrier's voicemail for a day or two. Call the number from a landline and from a phone on a different carrier. If one works and the other does not, the problem is on the route between those carriers, which only your carrier can fix.

Test 6: call the carrier with the right words (2 minutes plus the call)

An unpaid bill can suspend a line. A line can have a call-barring flag. A network problem in your area happens. Use these words, which skip the first level of script:

Calls to my number, 559-555-0142, are going straight to voicemail without ringing. My phone is on and has signal. Please check for any conditional or unconditional call forwarding, a barring or suspension flag, a port in progress, and any outage in my area. Then run a test call to the line while I wait.

Ask for a ticket number and note the date. If it happens again you can say "this is the second time since the fifth."

What Kerry found

Test 1: one ring, then voicemail. Test 2: nothing unusual. Test 3: *#62# showed her phone forwarded "when unreachable" to a Google Voice number she had closed in the spring. Any time her phone briefly lost signal, which it did several times a day in a metal-roofed parts warehouse, the call went to a dead end. She turned the forwarding off with ##002#.

What it cost: she takes about 5 calls a weekday, and she estimated one in three is a new repair job worth about $180. Over three days that is 15 calls, 5 jobs, and $900 that never reached her. Some of them rang again; some went to another repair shop.

Make a miss survivable

Once the phone is fixed, build in a safety net so the next failure costs less. Set forwarding "when unreachable" and "when no answer" to a number that is always answered, which is the opposite of what Kerry had. A text that goes out automatically when a call is missed is a second layer, covered in missed-call text back for small business. How to set up forwarding on a phone is in how to set up call forwarding on iPhone, and forward your business number to AI explains pointing a missed call at something that picks up.

Rocketship's phone worker answers the number you already have through call forwarding, so the unreachable-phone case ends with a conversation instead of a dead voicemail box. Each call comes back as a recording and a transcript. The bigger picture is in what happens to missed calls and phone system for small business. Two related fixes in this series: business phone not ringing, for when callers hear ringing and you hear nothing, and voicemail box full, for when the voicemail itself cannot take a message.

Rocketship finds the buyers, emails them from your own Gmail, follows up, and books the meeting on its own. Plans that get you customers start at $24.99 a month (Launch), and both Launch and Frontier start with a 7-day free trial, card required. Answering your existing number works on Launch, with call minutes bought as you go ($15 for 50), and a dedicated line is $5 a month.