This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

When I try to enter my mobile phone number, in whatever format, it says invalid phone number!

  • 10 replies
  • 1 has this problem
  • 1 view
  • Last reply by Gerd

more options

No more - that's it - I can't confirm set-up sync because it won't accept my valid uk mobile number in whatever format I enter it (0044, +44, ++44, with or without leading 0)

No more - that's it - I can't confirm set-up sync because it won't accept my valid uk mobile number in whatever format I enter it (0044, +44, ++44, with or without leading 0)

All Replies (10)

more options

Never post any personal information because an adware robot could find it, and start sending you all kinds of spam. This includes e-mail, phone, and home information.


Separate Security Issue: Update your Flash Player or remove it using these links; http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac

Note: Windows users should download the ActiveX for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the ActiveX.

Flash Player Version: Version 29.0.0.171

https://get.adobe.com/flashplayer/ Direct link scans current system and browser Note: Other software is offered in the download. <Windows Only>

https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only> +++++++++++++++++++ See if there are updates for your graphics drivers https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

more options

Who or what is it you are sending your phone number to?

more options

Firefox. Just entering it in the Firefox pop-up box that you get when you click on the confirm email link to set up 'Sync' with mobile phone.

more options

I called for more help. Have you tried entering the number without # or +  ?

more options

Tried makes no difference. The box offered me a +34 start because I'm in Spain but I don't have a suitable Spanish smartphone so I changed it to my UK code +44 and it gives me invalid phone number however I enter it. Is it because the server knows I'm in spain and won't accept a UK phone? If so, it's a pretty silly restriction and the software needs re-writing to accept any international code.

more options

It shouldn't be necessary to use a mobile device to confirm a Firefox Sync account.

Did you setup additional devices?

more options

I was just following the on screen instructions on my Mac from Firefox to sync the phone after setting up the account and it asked for the phone number to send a link which seems quite reasonable but it wouldn’t accept my Uk mobile number as valid however I entered it as explained previously. This is exasperating!

more options

Can you be reached in your current location under that number?

I assume that the Sync server wants to send some data to that device.

more options

Yes I can. Is it because I’m in Spain and the server/software demands a Spanish number? (It pre-loaded the Spanish international code).

more options

That shouldn't be a problem, I was able to set up Sync with my German phone number in China. There should be also a small "skip" link in the bottom left or right corner of the signup form.