Can I connect my business mobiles?

vivi® have 2 options for connecting your business mobiles to your IP Phone System

vivi® VoIP Sim Card

The vivi® voip sim could be the best mobile phone solution for your business making your business mobile phones a true extension of your telephone system.

The vivi® voip sim bridges your telephone system and your mobile phones’ voip sim card.  Theres no need to install any software, just insert the vivi® voip sim in to any unlocked mobile phone and easily make and receive calls as if you were at your place of work via your business phone number.

The vivi® voip sim allows you to extend telephone system services like call recording, call hold and transfer on to your mobile phone, and give a more professional impression to your customers by using your company telephone number when dialling out from the mobile phone.  

Lower your costs

Calls between the sim and any other handset on your vivi® telephone system are FREE, allowing you to considerably lower your communication costs by removing the cost of calling between your office and mobile phones.

The vivi® voip sim appears on your regular monthly bill as an extension number, along with the rest of your handsets, and calls, SMS and data are billed monthly as normal.  

How does it work?

This is a voip sim card, not software.  This does not require the use of data on your mobile phone and will work when your mobile has no data connection.  

There’s no need to download software or configure anything, you just put the sim into any unlocked mobile phone and start using it straight away.  The voip sim links seamlessly in to the vivi® VoIP network via the O2 mobile phone network.


  • Outbound caller ID control – display your company (or other) telephone number as your caller ID from the voip sim card – give your mobile phone a local (0203, 0121 etc) or national (0800, 0843 etc) number instead of a mobile number, or use your existing number.

  • Call recording – record all inbound and outbound calls on the voip sim card

  • Live billing – view calls made from the voip sim card along with your other extensions in the Live Billing view on the customer portal

  • Remote call monitoring – remotely monitor the mobile calls from another extension

  • NEW – Call Transfer – transfer calls straight from your mobile phone (using either attended or blind transfer) to another destination.

  • NEW – Call Hold – place callers on hold and play them either standard or customised on hold announcements whilst on a call on the mobile phone.

  • When someone calls your business number you can make your mobile ring as well as other vivi® handsets and voip sim cards.

The vivi® voip sim makes your mobile phone a true extension of your business telephone system, and the perfect choice for any business that uses mobile phones.

Using a Softphone Mobile Application

Using 3rd party software on your mobile phone will enable you to use your mobile phone as an extension of your office phone system.

This means that you can make or answer calls when you're out and about or staff at the office can transfer calls to you.

Additionally you may also want a direct dial (geographic or 0844) number so you don't have to disclose your mobile number, and we can also set your outbound caller ID to that of the office or your direct dial.

This uses your mobile phone's data connection and doesn't connect to your mobile number directly, so you avoid the cost of calling the mobile directly as calls within our network are free.

We recommend that you are connected to a 3G or WiFi connection, otherwise call quality may be poor.