iPhone Screenshots


Designed from the ground up with the mobile user in mind, Groundwire is the first mobile SIP Client capable of replacing your desktop phone.  Combining all the features business users need (see below) with intuitive features created with the mobile user specifically in mind (number rewriting, address book matching and more), Groundwire will quickly have you wondering how you survived without it before.

Check out the tutorials and knowledgeable articles at the links below:


For the list of providers and VoIP services tested with Groundwire, see http://www.acrobits.cz/about-us/partners#tab_verified-voip-operators

And check out https://www.acrobits.net/products/retail#tab_softphone for a side by side comparison of the most popular features of Acrobits Softphone and Groundwire.

*CallKit support!
*Push Notifications for long battery life
*Video Calling - H263, H264 and VP8 codecs
*Multi line
*SIP SIMPLE messaging, with picture, video and other attachments, typing and delivery notifications
*Call conferencing
*Transfer and attended transfer
*Call waiting
*Voicemail Notification and programmable Voicemail dialer
*ZRTP support (through in app purchase), the latest in secure calling for SIP
*Busy Lamp Field
*backgrounding support
*Call recording (only available for SIP calls, will not record calls from your GSM line)
*Bluetooth headset support
*Customizable ringtones
*Quickdial, your favorite contacts only one tap away
*Number rewriting, edit your existing contacts for SIP dialing without creating additional entries and program specific number to be dialed through specific accounts automatically
*in-call quality indicator, see network quality, packet loss and jitter
*Background noise suppression
*Quick import of accounts from major VoIP providers including sipgate, callcentric, voipcheap and many more.
*TLS support for encrypted SIP
*SIP Proxy Support, VPN Support (configure VPN in iOS settings)
*Excellent sound quality, supports OPUS, G.722, G.711, iLBC and GSM.  Make an in app purchase to add G.729 for great performance over 3G networks
*SIP Log for troubleshooting

If you have an issue with Groundwire, please contact our support even if you leave a review stating the problem.  Groundwire is highly configurable so problems that seem insurmountable may just require a couple of adjustments to the settings.    

Groundwire fans, please rate Groundwire or leave a review.  


SIP - Groundwire is a SIP Client, not a VoIP service. You must have service with a VoIP provider or PBX that supports use on a standard SIP client to use it.

VoIP over 3G - Be aware that some mobile network operators prohibit or restrict the use of VoIP over their network.  They may prohibit the use of VoIP or impose additional fees and/or charges when using VoIP over their network.  By using Groundwire over 3G, you agree to abide by any restrictions your cellular carrier imposes and agree that Acrobits will not be held responsible for any charges, fees or liability imposed by your carrier for using Groundwire over their 3G network.

What’s New

Version 3.8.16

bugfix release: the previous update broke compatibility with old devices (iPhone5 and older)

Ratings and Reviews

4.8 out of 5
16 Ratings

16 Ratings

The VoIP People ,

Far better than Bria

Have had to stop recommending Bria to my cloud Voip customers since they moved to their subscription model that promises features at extra cost that are included for the one-off fee for Groundwire. However, I wish I had found Groundwire years ago because it performs so much better, especially when it comes to incoming calls. Doesn’t matter whether the app is in foreground mode, background mode, in lock-screen mode or even not yet started, this app will ring as normal, just needing a swipe to answer. None of the notification banner, fingerprint or passcode entry, that Bria has which means you almost inevitably miss the call with all the messing about. And the battery life isn’t affected too much - brilliant, I’m happy with the user interface, very similar to native iPhone app.

Developer Response ,

Thank you very much for your review!

Baller_88 ,

Actually works

I tried almost all the free SIP apps, and then a trial of Bria and had no luck (I almost gave up on iOS SIPs altogether).
With ground wire it really is native, when you get a call it’s just like a regular call even when you close down the app as if some other server is taking care of the job and not the app and sending it to apple. This is more evident because after the call the app remains unopened, it’s the only app I’ve ever seen that is like this — it’s comparable to sending WhatsApp messages on the iOS messaging service.

Johnnyfm2011 ,

The best Softphone app by a long shot

Been using Bria for many years for our business. That is UNTIL now. Came across Groundwire and it is outstanding, the push feature works perfect and never misses a call. Therefore because it works with push it has no effect on the battery.
It’s a shame I hadn’t come across this app years ago.

Well done guys.

Just need to sort a slight bug with speaker phone staying on with some incoming calls. But I have already contacted customer service who replied within 24 hours saying a fix should be on the way soon as they are aware of the bug.

All in all a great app and well worth the money.

Thank you


55.1 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad and iPod touch.


English, Arabic, Bulgarian, Czech, Danish, Dutch, French, German, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian, Persian, Polish, Portuguese, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Vietnamese

Age Rating
Rated 4+
© 2010-2019 Acrobits
In-App Purchases
  1. ZRTP For Outgoing Calls £23.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

  • Siri

    Get things done within this app using just your voice.

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