Onsim is new type of highly advanced mobile network, designed to redefine what can be expected from your mobile carrier. We put a range of highly advanced features 'on a sim' to enhance your mobile network experience. It's unified communications, but with a unique 'mobile first' approach that integrate natively into your mobile rather than requiring OTT apps.
Uniquely you can choose to display either your landline or a mobile number when you make calls. You can even display a shared 'office' number across multiple sims. The person you are calling will see whatever number you set as your caller ID and if you choose to display your landline they would not know it’s been made from a mobile. If you have a team with multiple mobiles this allows you to share the same landline for both outbound and inbound calls.
O2, Vodafone and EE. Our SIM's can roam across all three of the UK’s top mobile networks to maximise coverage. You get the benefit of all three networks through a single SIM. The SIM's will always try and connect to O2 if available but If they lose signal they can connect to Vodafone or EE if their coverage is better. We can manually configure this in other ways based on your requirements so let us know if you are having coverage issues with certain networks.
It’s very reliable! Because we use three mobile networks we can offer wider coverage and better redundancy than other UK mobile networks or MVNO’s. Because our network is targeted at businesses the reliability of our service is of paramount importance to us.
No! VoIP (Voice over Internet Protocol) sends your calls over the internet via your data connection and you typically have to use a third party app instead of your native dialling app. Our SIM's uses traditional GSM mobile networks to make calls the way your mobile was designed to work. Because you’re not relying on mobile data or WiFi the reliability and call quality is much higher.
No. This isn't a 'soft phone' or 'VoIP' app. Once you insert one of our SIM's you just use your mobile as normal to make and receive calls, text and use data over our network and benefit from our wide range of features we offer.
BT’s Cloud service is a VoIP service. You need to install an app on your smartphone or use an IP phone. Calls are made using your data or WiFi connection so your connection needs to be incredibly stable or you can’t make clear calls.
One net is probably the most similar service to Onsim in terms of the way it works. You are however locked into using only the Vodafone network and it’s very expensive - up to 4 times the price of our service.
A virtual landline is a landline with a permanent divert to a mobile number. Inbound calls to your virtual landline will be forwarded to your mobile but they don’t allow you to make calls from your landline number. Therefore if you miss a call and want to dial back you will be displaying your mobile number not your landline.
Our SIM’s are enabled to roam worldwide. Roam Like at Home applies whilst in the EU but please check with support before roaming outside the EU. Roaming charges are significantly more expensive and you are liable to pay any charges incurred – we do not offer roaming capping on your bill as this is a business service.
No – not all UK landlines are SMS enabled so SMS is sent from your underlying mobile number to make sure your texts are delivered correctly. If you need SMS on your landline speak to our sales team for alternate solutions.
Yes – If you need your customers to ‘press 1 for sales, two for…’ we can help you set this up on your Onsim system. Please speak to support regarding setting up your IVR. Please note that this is not available on single user systems.
If you're looking for business mobile handsets contact our sales team for a tailored hardware quote. We can offer mobile hardware leasing through one of our partners or you can purchase a handset from a third party. Just make sure it's not locked to another network or it won't work with our service.
Yes – we offer a twinned service that allows you to connect any supported VoIP handset to your Onsim service. This means your landline number can ring on both your mobile and your office phone simultaneously, share a voicemail and loads more.
When you request a SIM and choose a number we will reserve and hold your chosen number for one month. Only once you activate your SIM (including successful payment of your first invoice) is the number registered to you and guaranteed. Only after registration does the number belong to you and can be ported out of our systems. Please refrain from publishing your number (printing any stationary) until it's registered and you've tested it.
On activation you will be immediately billed a pro-rata charge for any remaining days in that month. Your first full bill (and all subsequent bills) will be charged on the 1st of each month. Call charges (over allowances) are billed 1 month in arrears. Please note your services will also be pro-rata for the first month (i.e if you have 2GB of data and sign up exactly half way through the month you will only have an allowance of 1GB until your allowances re-set on the 1st.
You will be billed via a saved Debit or Credit card. For accounts paying more than £50/month we also can accept direct debit. You must have an active, automatic method of payment saved in your account as per our terms of service.
1 month plans plans do not require a credit check for activation but we restrict premium rate, service and international calls from being made until a credit check has been passed. We may perform a credit check for 12 month subscriptions and if activation of more than 5, 1 month SIM’s are requested on an account.
Yes – your landline number belongs to you and you can move it to another landline provider. The right for businesses to be able to transfer their landline number is protected by our governing body Ofcom so we couldn’t stop you from moving elsewhere. Please note that if you do intend to port a number to another provider you must keep your service with us active until your number transfers to your new provider. You will need to pay for your service up until the day after you port it to prevent your number being de-activated. Porting your number doesn’t cancel your contact or contractual obligations to us. Please see our terms for more information on porting.
By raising a support ticket. In order to resolve issues fast and speed up resolution times we ask that when raising a fault customers provide a minimum of one call example demonstrating the fault. We require the time and date of the call example and the numbers involved. If these aren't provided at the time the fault is raised there may be delays in investigating the issue.
We provide phone support to customers that have an optional phone support add-on or support contract in place. As standard, all support is via support ticket. Based on our experience, feedback from customers and the sheer number of enquiries we receive we are confident this is the best way to support our customers in an efficient and fair way.