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AT&T announces NumberSync, a way to use one phone number across several devices

ATT store sign
ATT store sign (Image credit: Android Central)

AT&T has introduced NumberSync, a new service from the carrier that will allow you to use a single phone number across multiple devices to remain connected at all times. NumberSync is a network-based service, meaning it doesn't rely on a Bluetooth connection and your devices don't even have to be near each other for it to work. The idea behind it is to be able to have a single number that can work across multiple devices, so if you leave your smartphone at home you can use your smartwatch to keep in touch.

With NumberSync, you'll be able to send and receive texts and calls from your tablet or wearable using the same phone number that your friends and family recognize. AT&T is working to integrate NumberSync into future devices, with the first device launching soon. It's likely that the LG Watch Urbane 2nd Edition LTE is the first supported device, as the carrier has already announced that it would be carrying it. AT&T hopes to have additional devices with NumberSync support available this holiday season.

Jared started off writing about mobile phones back when BlackBerry ruled the market, and Windows Mobile was kinda cool. Now, with a family, mortgage and other responsibilities he has no choice but to look for the best deals, and he's here to share them with you.
40 Comments
  • Like Google voice? Posted via the Android Central App
  • +1 Posted via the Android Central App
  • Exactly. I'm sure AT&T will charge for this, while with Google Voice it's free. Google Hangouts even adds the ability to use VoIP for your calls and texts. Posted via the Android Central App
  • Um, I kind of have this using MIghtyText. Oh yah, and then there is the Hangouts Dialer thing oh and Skype and.... Hey AT&T, instead of pushing crapware and stupid services, how about you put your billions into improving your network and being less of a tool. I look forward to hearing from Randall's lawyer.
  • Those are great ideas that AT&T should adopt, and pay you for. Posted via the Android Central App
  • If you think MightyText is great you should try it mySMS. It's MightyText on acid. Totally customizable and you can receive texts and sync your messages across several devices like MightyText except it's just better :-) Posted via the GS6 Active, aka GS6 M.E. (Manly Edition)
  • Actually, this is pretty great. A new sim in a new device usually means yet another number, and when watches really become independent it would be awesome to be able to go out and leave the phone at home while seamlessly getting messages. Good feature.
  • Yeah I think this is great actually Posted via the Android Central App
  • and this is why i use google voice. i guess att considers it reinventing the wheel?
  • Yes, that is true. But does it work seamlessly across a smartwatch also?
  • Does your smartwatch have it's own number assigned to its sim card? if so then yes it can work seamlessly with that as well for calls coming in.
  • Because this is different. Say you have two phones. One Android, one iPhone. You use both. Now, you have to remove and transfer the SIM to the one you will use that day/week. With this plan, you can have a SIM in each phone and just grab the phone you want to use that day or whatever and you're off. Moving the SIM is easy but can become aggravating (along with wearing the SIM out over time). This isn't some GV replacement like everyone keeps saying. It's to share one line with two SIMs.
  • Just like Google voice. Posted via the Android Central App
  • Clever but no. With Google Voice if you don't have an active SIM in the device you grab for the day, it won't connect to anything. Unless you plan on being tethered Wi-Fi via some other method the entire time this is not like Google Voice. I love how everyone keeps saying that. It's comical. Posted via the Android Central App
  • I am sorry but you are WRONG. Google Voice is exactly the same. At least I'm NOT understanding your description. For instance, I have a Note 4 from Verizon). I ported my old VZW number to Google Voice. If you call that number, it will follow me in the UK, USA on my Note 2 (old), my tablet and my desktop. In fact *ANY* device logged into my google account that has a speaker and MIC will work. And it does work. If you were to call me now, all devices turned on will ring at the same time. Whichever one I answer, the others just go quiet (my only beef is they all say missed call when Google must know, I didn't miss it) - LOL Last but not least, whichever device I pick up (and call or text from) see my Google Voice number as the number it comes from. It's all done through one dial-app they now call hangouts. It will even speech to text and email you any voicemails. This has NOTHING to do with SIMS. I have a Vodafone PAY as you go sim in the UK, I have a Verizon Sim in the USA (but no-one actually knows or cares what the VZW or UK numbers are). Call my US Google voice number and call me / or text me and it works. I've been using it for 7+ years to solve the very same problem AT&T are trying to solve. It's basically and simply a cloud-based phone number for LIFE. I have had this number for nearly 20 years now and it's now at Google. First - With Google Voice (Now hangouts) *and* this copy from AT&T, the device needs to be connected (and mobile devices have to have a SIM or WIFI connection)
  • Can't use with two phones according to the verge. If you're hoping to be able to use this feature to have two phones linked to the same number, as one unnamed Verge editor does, I've got some bad news for you: AT&T says it's only for linking one phone to secondary connected devices.
  • exactly, cause no way would att give you active service on two phones with one number at the cost of one line. you could share the number with a spouse and have data on both phones off the one cost if that was true.
  • They could probably figure this out if they wanted to? Spotify figured out how to only let me stream to one device at a time.
  • Google voice is great for phones, but does nothing for tablets, watches or vehicle and portable hot spots though. Its a good service that was long over due.
  • Google voice works just fine on my two Android tablets and a smartphone with no sim in it. I can place and receive calls from and to my Google voice number on carrier data or WiFi. I also place and receive texts from and to my Google Voice number on carrier data or WiFi since I let Hangouts merge my text and Instant Messaging. Also get voice mail notifications on all devices as well as Chrome browser on my PCs. I can also change carriers at any time and never have to port my cell number again. Google voice rocks and I doubt the at&t system will be able to do all this. Posted via the Android Central App
  • Exactly. I do the same.
  • I have no experience with it on a wearable or in the car, but I use GV (via Hangouts) on my tablet all the time. My Shield Tablet is a *much* better speakerphone than my actual phone is.
  • I use my Nexus 7 as a phone using Google Hangouts. It uses the same Google Voice number as all my other phones. In addition, I can switch devices midcall, and choose which device I want to answer the phone on... on the fly, or even schedule periods to not ring specific devices. Posted via the Android Central App
  • Huh? Posted via the Android Central App
  • I would much rather be able to have more than one phone number on a single device (phone). Posted via the Android Central App
  • Now that would be very useful!
  • That would confuse the living daylights out of me. But if that makes you happy then go for it I guess.
  • This looks like a good service. https://www.androidcentral.com/e?link=https2F2F... But I get that you want more than one number through your carrier.
  • You can do that with Google voice Posted via the Android Central App
  • Will my Gear S get number sync? That would be awesome.
  • I would like to be able to use 2 phones with the same phone number. Posted via Android Central App on 1+1
  • Exactly.... All I want to do is be able to use my larger nicer phone for normal daily tasks and a smaller cheaper more expendable phone for the gym, running, days and the beach without swapping the sim back and forth.... Posted via the Android Central App
  • +1 (no pun intended)
  • Get rid of the one plus, you will be happier Posted via the Android Central App
  • I'm curious how this works regarding data usage. I have an old unlimited data plan and would like to be able to jump that to a tablet.
  • I see think being very different than Google Voice. This allows you to use the same phone number of two different sims. So that if you got a call or text it would be delivered to both Sims simultaneously. (let's say phone and smart watch) Google Voice is more of a phone number forwarding system from one phone number to another phone number, not from one sim to another sim.
  • Yeah, I think it's technically very different from GV, but functionally pretty similar. Either way, it sounds like a useful service for AT&T to offer, as long as they don't charge an arm and a leg for it.
  • I'm sure they will still charge some $15 access fee. Posted via the Android Central App
  • It needs to work on the 6P and Lumia 950xl, but it never will. I don't do carrier advertising machine branded phones anymore. Oh well, will continue to SIM swap.
  • It's actually free. If you take the time to look, they say that in their description. Posted via the Android Central App