Acrobits Groundwire 4+

Business Caliber SIP Phone


    • 11,99 €
    • Offers In-App Purchases

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

And check out 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 3.8.42

- fixed an office365 related crash
- possibility to control automatic hangup after successful transfer
- display a Contact displayname passed in BYE after successful transfer (e.g. parking slot info)
- correctly unregister when deleting/disabling an account

Ratings and Reviews

4.3 out of 5
56 Ratings

56 Ratings

DirkKn ,

Wieder besser geworden

seit dem letzten Update. Die Bedienung ist jedoch nach wie vor sehr träge. Nach einem Tastendruck auf einen Favoriten dauert es ca. 2 Sekunden, bis der Anruf startet.

Developer Response ,

Hello, we do mention the auto-renewing nature of Wifi Finder on many places, although only in English. We'll be adding German translation in the next update.

We also plan adding an option to hide the WiFi finder; we recognize that for some Groundwire users it is not useful. As for the SIP functionality, if you have any specific issues with the SIP functionality of the app, please let us know.

Gri447 ,

am iPhone sehr gut

Läuft am iPhone sehr gut, am iPad leider nur die gezoomte Version, am M1 Mac startet es gar nicht, was sehr schade ist, da man sich dann an bestimmten Orten ein Gerät sparen könnte.

Arne S. ,

Nicht schön aber funktional

Die beste SIP-App, die ich kenne, und diese ist nicht meine Erste. Viele Möglichkeiten der Einstellung und Auswahl an Codecs. Ich nutze diese Application mit 'nem iPhone 5se und Sipgate. Per UMTS und W-LAN gute Erreichbarkeit & Sprachqualität. Push funktioniert nicht zuverlässig. Ob es an Groundwire oder Apples iOS liegt ist unklar. Aber die Nummer steht im Display - man kann ja zurück rufen, wenn's passt. ; )

App Privacy

The developer, Acrobits, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Contact Info
  • Identifiers
  • Diagnostics

Privacy practices may vary based on, for example, the features you use or your age. Learn More


  • Siri

    Get things done within this app using just your voice.

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