Our SIP2SIM service provides new ways to use a mobile phone...
Note: The old SIP2SIM service closed at the end of April. Find out more.
Some aspects of the service are not in place (e.g. no data allowances yet). Email trial@aa.net.uk with any queries.
Here is where you may find a use for SIP2SIM®
Don't want to put your personal number on your van?
Using the dual SIM feature in many phones you can add a second SIM, or more likely an eSIM, with a separate service and number.
Easy to have a work number on your phone, separate ring tone, recorded calls, set contacts to call/text from work number automatically (a feature on iPhones).
It does not even have to be an 07 mobile - why not have a proper local phone number to engender trust as a local tradesman?
Some people spend as much time out on the road as in the office. By using a SIP2SIM®, your extension number can be set to ring both your desk phone and the mobile, making it easy for customers and colleagues to contact you.
As the SIM has the same feature set as any other SIP phone connected to the PBX, then features such as call recordings are also possible. Ideal for solicitors, those in the finance industry and others, whose regulatory requirements ensure they have a copy of their phone calls.
Adding an eSIM to a modern phone is quick and simple.
We can issue a number (landline or 07 mobile) and eSIM within minutes (paid with order).
We can do a service for as little as a month, or as long as you need. Even if you keep the number, you can simply disable the eSIM when not needed (still has month charges in that case).
With the demise of old fashioned phone lines, why not move your existing landline number to your mobile phone.
Either as you main phone service, or an extra number on your phone using a second SIM or eSIM.
Our VoIP service allows porting in your old number, and our SIP2SIM® service allows for that to be used on your mobile phone.
Of course, we can also provide an old school phone for your home on the same number, or DECT cordless, working at the same time as your mobile. But these days so many people use just a mobile phone. This is perhaps ideal where mobile coverage is poor inside your home.
Our SIP2SIM® service will be available as an eSIM or a physical SIM card. eSIMs can be used in modern phones whilst physical SIMs can be used in an older phones.
The service uses 4G/5G VoLTE, but can normally fall back to older 2G services.
The service then makes that phone appear as if it is a SIP extension (e.g. SIP phone) on your own VoIP PABX or the a VoIP service. We can provide our usual telephone services and a UK landline or 07 mobile number, along with all the other benefits of our service such as call recording etc.
We are providing early access to this new service with eSIMs now, but there are still some steps before we have proper ordering and launch.
SIP2SIM® is not a SIP app running on a smart phone over mobile data or WiFi! Having tried to make this work reliably, this was determined to be unpredictable at best, and completely useless at worst.
With this service your mobile phone is working as a mobile phone on the GSM mobile network using 4G/5G VoLTE; making and receiving proper mobile voice calls. GSM is a very mature technology, adept at handling changeovers between masts and packet loss, without breaking up.
And with most modern phones this can be a second line on the phone, ideal for home/work usage on one mobile phone.
The SIP2SIM® service makes your mobile work like a SIP device connected to a SIP phone system or VoIP provider of your choice. It can also be supplied pre-configured to an A&A VoIP number making your mobile work like a normal mobile phone but with a landline-style number.
The basic service allows you to specify, via our control pages, the server name, login and password for a SIP server. This could be your office phone system; an asterisk box, 3CX, FireBrick or similar.. As long as it handles normal UDP SIP with G.711 A-law audio then the service will register to it as a phone and allow calls both ways.
This means your mobile handset becomes an office extension, like any other.
(Note, CLI shown on mobiles may be limited due to recent OFCOM rules)
Below is further information about the service:
Cost explanation
Calling emergency services
Calling 999 and 112 is possible.
Third party SIP services
The service involves entering SIP registration details in to our control pages. Where these are the details of your own SIP server such as an office phone system, you can make the decision as to whether or not you trust us with those SIP details in order to provide the SIP2SIM® service. We will, of course, use all reasonable skill and care to ensure the details remain confidential and are not disclosed.
We have, however, designed the service so that it can work with a wide variety of third party SIP services, not just in the UK but in various countries. There are a lot of unusual systems out there and we continue to work to ensure that such services operate with SIP2SIM®. However, using third party SIP details may well be in breach of your terms with the third party SIP provider as it means giving us your SIP details. It is up to you to check the terms and we would not suggest anyone breaks a contract they have. You may find that the provider is happy to trust us, especially if they do any other work with us, so it is worth asking. We are also happy to discuss contracts with other providers for the SIP2SIM® service and we may be able to provide them with branded SIMs to sell to their customers.
Unfortunately we cannot guarantee that the service will always work with all other providers, and whilst we aim to resolve any technical issues (with reference to the standards), if a provider simply will not deal with our service and blocks us there is little we can do.
Custom branding
Our voice and data SIM cards are ideal for a corporate network or for a wholesale customer to set up their own mobile service.
We can offer branding with professional quality SIM printing and pre-set settings.
We have a page with comprehensive list of technical details and restrictions and further articles in the knowledge base article which can be seen below.
