How do you know if someone changed their number on At&t?

How do you know if someone changed their number on At&t

How do you know if someone changed their number on At&t?

If your message is sent to voicemail, the number is still active. If the number had been disconnected, you would receive a direct message that the phone number was no longer active or that the subscriber was not receiving calls at this time. Those responses could indicate the phone number is canceled or suspended for non-payment

There is no sure way to tell. When you call, you might get a message that your contact number cannot be reached or the caller is not accepting calls at this time, meaning their number could be canceled, changed, the phone could be turned off, dead battery, or your number could be blocked on their end.

Troubleshoot your device

It is possible that your device may have got some network problems and may require a reset. Here’s what you can do

  • Turn your phone off and back on.
  • Make sure you have service in your area. Check out the AT&T PREPAID Coverage Map.
  • Activate your AT&T PREPAID account, refill your minutes, or renew expired AT&T PREPAID plans at the AT&T PREPAID Support Center.
  • Be sure that you and your callers use 10- or 11-digit dialing when placing calls.
  • Learn how to call or message around the globe if you’re traveling outside the U.S.
  • Check out Device Support tutorials and videos that’ll teach you how to:
  • Turn off Airplane Mode. Most phones display an airplane icon when Airplane Mode is on.
  • Turn off Do Not Disturb or Quiet Hours. Some phones have this setting to keep you from getting calls during certain times or while the setting is turned on.
  • Turn off Call Forwarding. Press #21# on your phone and then the Call, Send, Talk, or Receiver key; if your calls continue to forward to another number, learn how to turn call forwarding on and off.
  • Check the Blocked Calls or Reject List. You can block calls from specific numbers on some phones or create a reject list to avoid calls you don’t want to get.
  • Insert SIM card. Steps to Remove and reinsert the SIM card if your phone displays Insert SIM or Emergency Calls Only.
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Not attending calls

The possible reasons you would get this error when calling someone is that their:

  • The account is not in an active status.
  • Incoming calls are blocked via a service or device feature.
  • The number is in the process of being ported to another carrier.
  • The phone is off, and voicemail is not set up, or they are out of range.

These are all possible reasons if they are not attending your call. Otherwise, they might have changed their phone number. Suppose you’re trying to call/text someone after they change their number. In that case, you might not get any message at all – cell phone numbers get reassigned relatively quickly, and the new owner of the number might be ignoring unknown calls/texts. It is also possible that the person you’re trying to reach may have blocked your number or is simply ignoring you. In either of those cases, they are not attending to any message either.

The best way to determine whether a number is still in service is to call it. A voicemail account belonging to an individual proves that the number is still being used. Suppose the number has recently gone out of service. In that case, you’re likely to get an automated message saying the number isn’t in service or that the call can’t be answered.

AT&T Number check

If you want to know if the other person still uses their AT&T number, there is a way to find it out. By checking whether a cell number is on the AT&T network, you can potentially save yourself some money. 

AT&T customers with free mobile-to-mobile calling can talk to other AT&Tcustomers without fear of going over their minutes. In addition, the mobile carrier provides an online tool that customers can check if a number is on the AT&T network. If you are not an AT&T customer, you can still determine if a number is on the network or not.

Non-AT&T Customers

  1. Access a cell number lookup online tool such as Fone Finder or SearchBug in a Web browser.
  2. Enter the 10-digit cell number in the appropriate field. Click “Search” or “Verify.”
  3. Review the search results. The carrier for the number will be listed as the mobile provider or wireless carrier.
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AT&T Customers

  1. Access in your Web browser and click “Login” in the menu located in the upper right of the screen.
  2. Log in to your wireless account with your 10-digit cell number and password.
  3. Hover over “My AT&T” in the top menu and click “My Rate Plan.”
  4. Scroll down and enter the 10-digit cell number you want to check in the appropriate field under “Mobile to Mobile” on the right side of the screen.
  5. Click “Go” and review the results. If the number is in the network, “In-Network” is displayed.

How to know if the number is changed or power off?

If the phone is just powered off, then if you call it, your call should go straight to voicemail. If they have changed their number and the number has yet to be reallocated (usually several months are allowed), then you will likely get an operator message telling you that the number is not recognized/unobtainable, etc.  

Are you Blocked?

Text messages can provide some clues about whether or not a person blocked you, although it’s a more reliable method for iOS than it is for Android. On iOS, after you send a text, you’ll usually get one of two notifications right underneath your message: “Delivered” or “Read.” The former means that your text message went through, but the recipient hasn’t read it yet.

If you call a person who’s blocked your number, you won’t get any notification about it. However, the ringtone/voicemail pattern won’t behave normally. If the phone rings numerous times but goes to voicemail, that may mean the phone number is still in service. If the number is not in service when you call, it may ring once or twice, but you will then get an automated message. This message will state that the number is no longer in service or something similar.

Some tricks that you should try

  • Conceal your phone number when calling. You can type *67 before you dial their number or disable caller ID from outgoing calls in your phone’s settings.
  • Call from a different phone number
  • If you have a trusted family member or mutual friend, ask if they would be willing to contact the person directly for you.
  • Attempt to reach out via social media or email.
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While you can use any of the above options, continued attempts to contact someone who has taken steps to cut communications with you can be viewed as crossing a line (harassment or stalking), which could result in legal consequences.

One of the best things you can do in this situation is not to reach out repeatedly unless you have reason to believe the person is in danger. If this is the case, notify authorities; otherwise, step back and take a few days between calls to offer the other person an opportunity to get back to you.

Check Phone number is active or not

You need to know if the number is active or not. You can use the Search bug, and it offers two solutions to check if a phone number is active. The first is a phone validation API. APIs are beneficial if you collect data via web forms because they check the data at the entry point. This prevents incorrect data from entering your database. 

The phone validation API checks if the phone number is active if it’s disconnected or inactive, and whether it’s registered on the DNC list. It also provides line type to sort your data by cell phone or landline to help with marketing strategies and only send text messages to numbers that can receive them.

The second solution is batch verification. You can use this if you collect numbers outside of web forms. You take your list and run it through the batch verification system to check the validity of the numbers. These tools will help you to verify if the AT&T or any other network number is changed or not. 

A phone number goes inactive if it is not used for a long time; the number is then redirected to other users. The waiting time to reactivate your phone number is around 90 days, which may differ among other service providers.


We discussed various options to check if an AT&T number has been changed or not.  It is not necessary that they have changed or blocked you. It can be a network issue causing problems, so try troubleshooting your device and try again. You can also check out if the AT&T number is still active by visiting their website