Set your Landline Free with ONSIM

The revolutionary service that puts landline numbers & business features on mobile SIMs without apps or diverts

Pick your Landline Get a SIM Activate your SIM

Mobile Ladline SIM Offer

Why ONSIM?

Are you giving your personal mobile number to customers or using an app for calls? Then ONSIM is the solution for you - A mobile SIM with a landline number that doesn't require internet or apps

Learn More
  • Your Business Landline... Anywhere

    Make and receive calls from your landline number on your mobile without apps

  • Advanced Features

    Just because you're mobile doesn't mean limited features. Extension Numbers, Hold & Transfer, call recording & loads more right on your mobile

  • Multi-Network

    Our super SIM's can roam across O2, Vodafone and EE offering the best possible coverage wherever you are.

  • Great for Teams

    Add additional users & you can share your numbers across multiple SIM's for both inbound and outbound calls

Mobile Phone System

Powerful Business Features

We put full featured office phone systems in your pocket when you're on the move. See below for a range of features you can get on your ONSIM - it's everything your fixed or VoIP landline can do and more.

Landline Caller ID

Display your landline number when you make outbound calls

Multi Network

SIM's can roam across O2, Vodafone and EE for the best signal

Transfer Calls

Transfer calls to other mobiles or landlines

Pair with your Desk Phone

Have your fixed phone and mobile ring simultaneously

Hunt Groups

Use hunt groups to ring multiple ONSIMs simultaneously (requires 2+ users + additional number).

Call Recording

Record your mobile calls on network - click here (additional fees apply)

These are just some of the great features and benefits of our mobile landline SIM.
Call us now to find out more +44 333 880 4008

iPhone X Business SIM

How it works

ONSIM is all about taking the best part of your office phones with you in your pocket, creating the perfect mobile office phone system. We do this by routing your calls through traditional mobile networks (O2, Vodafone and EE) and and into our network. From here, the call can behave just like you made it from a landline and means we can provide all the features you would normally expect to find on a traditional office phone system.

  • Make and receive mobile calls from a landline number
  • Range of great features not available on other networks
  • Secure and Scaleable
  • Works on any UNLOCKED mobile handset - all you need is one of our SIMs
  • "One of the best services I have ever received!"
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    Mubasher
  • "Amazing company the service is second to none! Support staff are great Maddie has helped me so much. Really polite and helpful."
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    Star 5
    Smith And Sullivan Ltd
  • "My name is John Morrison I have two businesses and the girls at ONSIM were brilliant.....instant replies and very polite couldn't ask for more from them Thanks for everything"
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    John Morrison
  • "Luke and Sophie at ONSIM have been utterly brilliant with their customer support and backup system. Thoroughly professional and fully committed to supporting their customers."
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    Scott
Read more reviews on Trust Pilot

SIMple Pricing

  • BASE

    30 Day Rolling Contract

    £ 10 /user/month +VAT
    • UNLIMITED UK Calls & SMS**
    • Standard or eSIM
    • Advanced Features
    • No Data
      2GB 4G Data
      4GB 4G Data
      20GB 4G Data
      40GB 4G Data
      Mobile Call Recording
    • Pick new Landline or use existing
    • Cancel any time
    • Trusted by 2,500 UK businesses

    Get Started

  • Get a Quote

    Custom Pricing

    • Free no obligation quote
    • Custom pricing options
    • Mobile Call recording
    • Mobile Data

    Get a Quote

Want to speak to our sales team? Call us now on +443338804008
All prices shown are ex VAT

**UK Mins are outbound calls to major (O2, Vodafone, EE and Three) UK mobiles (07), landlines (starting 01, 02, 03) and freephone numbers (0800, 0808). Unlimited call and SMS allowances are subject to our fair usage policy (5,000 mins and 1,000 SMS). Usage outside of these allowances are charged at 5p/min & 5p/sms. By default we only allow calling to inclusive numbers to avoid incurring additional charges. You can request that these restrictions are removed at our discretion.
* 50% off for your first 3 months. New connections only. After 3 month offer period regular price is £10/month+VAT.