What call forwarding actually does

Call forwarding is a phone feature that sends incoming calls meant for one number to a different number instead. When someone calls your main number, the phone system redirects that call to wherever you've set it to go — your mobile phone, a colleague's desk, a different location, or even voicemail. The caller doesn't know the call was redirected; they just reach you.

This is different from call transfer, which you do manually during an active call. Call forwarding happens automatically before you even answer, and it stays active until you turn it off. It works on landlines, mobile phones, and business phone systems, though the steps to set it up vary by phone type and service provider.

Key Takeaways

  • Call forwarding redirects incoming calls to a different number automatically, and the caller doesn't know it happened.
  • Mobile phones usually have call forwarding in Settings under Phone or Call Settings, while landlines require calling your provider or using their online account.
  • You can set up conditional forwarding to send calls only when you don't answer, or unconditional forwarding to send all calls when ready.
  • Forwarded calls may incur charges depending on your plan and the destination number, so check with your provider before setting it up.

How to set up call forwarding on a mobile phone

On an iPhone, open Settings, tap Phone, then Call Forwarding. Turn it on and enter the number where you want calls to go. The phone will attempt to call that number to confirm it works, then save the setting. You'll see a small arrow icon in the status bar at the top of your screen when call forwarding is active.

On an Android phone, the location varies by manufacturer and carrier. Usually it's in Settings under Phone, Call Settings, or Additional Settings. Look for "Call Forwarding" or "Call Redirect." Enter the destination number and confirm. Some Android phones let you set different rules — for example, forward calls only when the line is busy, or only when you don't answer within a certain number of rings.

To turn off call forwarding on either phone type, go back to the same menu and toggle it off. Your phone will stop redirecting calls when ready.

How to set up call forwarding on a landline

Landline call forwarding is usually managed through your phone service provider's website or by calling their customer service number. Log into your account online, find the phone settings or features section, and look for call forwarding. Enter the number you want calls sent to and save the change. Some providers let you do this through a code you dial on the phone itself — typically *72 followed by the destination number — but this varies widely.

If you can't find the option online, call your provider directly. They can set it up for you over the phone in a few minutes. Ask whether there are any charges for using the feature and whether it applies to all incoming calls or only certain types.

Conditional forwarding vs. unconditional forwarding

Unconditional forwarding sends every call to the destination number when ready, no matter what. The original phone never rings. This is useful when you're away from your desk or traveling and want all calls to reach you elsewhere.

Conditional forwarding only redirects calls under specific circumstances. The most common type is "no answer" forwarding, which sends the call to another number if you don't pick up after a set number of rings — usually 4 to 6. Another type is "busy" forwarding, which activates only when your line is already in use. Some phones also offer "not reachable" forwarding for when your phone is off or out of service area. Conditional forwarding is useful when you want to stay reachable but don't want to miss calls when you're unavailable.

Charges and plan considerations

Whether you pay extra for call forwarding depends on your phone plan and provider. Many mobile carriers include basic call forwarding at no charge. Landline providers sometimes charge a monthly fee — typically a few dollars — though some include it in standard service. Check your plan details or call your provider to confirm.

Be aware that if you forward calls to a long-distance or international number, you may be charged for those calls as if you had made them yourself. A call forwarded to your mobile phone while you're traveling internationally, for example, could incur roaming charges. Ask your provider about the cost structure before setting up forwarding to an unfamiliar number.

Common problems and how to fix them

If calls aren't being forwarded, first check that the feature is actually turned on — it's straightforward to forget you activated it. Verify that you entered the destination number correctly, including the area code. Some phones require you to include a 1 before the number; others don't. Try turning the feature off and back on to reset it.

If the forwarded calls are going to voicemail instead of ringing through, the destination number may not be available or may be rejecting the call for some reason. Test by calling the destination number directly to make sure it works. If you're forwarding to a business phone system, that system may have its own settings that block or screen forwarded calls.

If you're being charged unexpectedly, review your bill and contact your provider. Sometimes forwarding to certain numbers — particularly international ones — triggers charges that weren't obvious when you set it up.

When to use call forwarding and when not to

Call forwarding works well when you need to be reachable at a different location temporarily — during travel, while working from home, or when covering for someone else. It's also useful for routing calls from a main business number to multiple staff members in sequence, or sending after-hours calls to an answering service.

Avoid using unconditional forwarding if you want to maintain a presence at your original number, or if you're forwarding to a number that might not always be available. If you set up forwarding and then forget about it, callers may reach you at an unexpected location or time. Always remember to turn it off when you no longer need it.

Frequently Asked Questions

Can I forward calls to multiple numbers at once?

Most basic call forwarding sends calls to one number only. However, some business phone systems and advanced mobile plans allow sequential forwarding — the call rings at the first number, and if unanswered, it rings at a second number. Check your phone's settings or ask your provider whether this option is available on your plan.

Will the person calling know their call was forwarded?

No. The caller sees only the original number they dialed. They won't know the call was redirected unless you tell them or they see a different number on their caller ID after you answer.

What happens to voicemail when call forwarding is on?

If the forwarded call goes unanswered at the destination number, it typically goes to that number's voicemail, not your original voicemail. If you want calls to reach your original voicemail after a certain number of rings, use conditional "no answer" forwarding instead of unconditional forwarding.

Can I set up different forwarding rules for different times of day?

Basic call forwarding doesn't have scheduling built in. However, some business phone systems and advanced mobile plans do offer time-based rules. Check your provider's website or call them to see if scheduling is available on your account.

What's the difference between call forwarding and call transfer?

Call forwarding is automatic and happens before you answer. Call transfer is something you do manually during an active call — you answer the call, then press a button or dial a code to send it to someone else. They serve different purposes depending on whether you want to redirect calls before or after you pick up.