01268 495555

Who we are and what makes us tick

Firstly, we are an O2 Direct Partner

This means we are authorised by the O2 Network to handle your mobile account for them.

As one of  the largest O2 Business Partners in the UK, we have been selected by O2 and together we share the commitment to providing a great customer experience and a trusted approach. With a Direct Partner you, the customer, get the enhanced benefits of our business expertise and flexibility rather than having to deal with the entire network structure. Unlike the networks, we treat you as an individual by offering a personal service throughout your mobile phone contract and after.

We are one of the top performing O2 Partners and have been awarded Partner of the Year. Established in 2002 we provide a professional business service you can rely on. We are in it for the long haul.

First class business service

At ADSI, we pride ourselves in excellent customer service; the majority of our customers come from referrals from our happy customers. We aim to answer your call within 3 rings and respond to an email enquiry within 24 hours (during working hours).

We understand that you are busy and we simply aim to make managing your business mobile phones a lot easier, leaving you to make the important decisions and get on with running your business.

With us, you get your own dedicated Account Manager

This means no call centres, no faceless voice at the end of the line; you have a named individual – a personal service just for you. Your account manager will handle your mobile phone account(s), give you advice, keep an eye on your bill expenditure, alert you of unexpected costs that could be avoided and inform you of any savings to be made.

Guaranteed on-going account management

Your bill(s) remain from O2, you will continue to be invoiced from them and payments are still made to them – none of that changes. But, your initial contract, upgrades and on-going account is dealt with by us.

You will benefit from our monthly Bill Manager which includes your O2 pdf invoice. Our unique bill manager report can be tailored to suit your business and individual needs. Mobile expenditure can be broken down into departments or cost sectors, as well as highlighting premium rate calls, data charges, international costs and much more.

Handset(s) if required

We will supply you with your preferred handset if you need one. If you have a problem with the handset throughout your contract; if it gets broken, if you have a technical issue or just need advice setting up – we will help you. In most cases we will provide you with a loan phone whilst yours is in repair/lost/stolen.

If you need to place a bar on a stolen/lost phone, we can do this for you. We will alert you when you are due to upgrade or when your contract is due for renewal. We will handle the entire process for you.

A host of other business services available to you

At ADSI, our portfolio of business services include landline telecoms, digital business solutions, broadband service, mobile protection plans, mobile device management, it support packages, energy consultancy and many other managed services. Whatever your business needs, we are just a call away.

Has this answered your question?

Click here to see what some of our mobile customers are saying

Want to find out more and start reaping the rewards? Call 01268 495555.




  • ‘We are very happy with the handling of our account.  Our Account Manager always deals with any queries and requests very promptly and efficiently and, importantly, we feel confident that we are kept informed of the best options for us.

    From comparisons we have made we do believe that we have saved money and would have no hesitation whatever in recommending ADSI to business colleagues.’

    Boshers Cholsey
  • ‘Corniche International have been using ADSI for all our telecom needs and have always found their service to be professional and friendly and the team are always there to help. We will carry on using ADSI for the foreseeable future’

    Corniche International
  • ‘Our Account Manager worked really hard at sorting our an almighty mess created by Carphone Warehouse, it’s great to have one point of contact and be able to have somebody who is prepared to take ownership of any problems that occur. ‘

    Capital Drainage
  • ‘I was dealing with one of your colleagues a couple of weeks ago regarding a fault with a new phone, I just wanted to say that they were brilliant, really efficient and got things sorted quickly’

    Johnston Mailing
  • “I would like to thank ADSI and our account manager. They have been great in finding the best deal for us and although we are a very small part of your business we have felt like our queries and concerns were being listened to and dealt with quickly. We look forward to continuing our relationship with ADSI”

    The Helpful Bureau
  • “Always been very happy with ADSI from day one. We get contacted constantly by other companies but we would never leave ADSI as the service is fantastic and our Accounts Manager is brilliant – he helps with all queries and is knowledgeable, friendly and  we feel confident that he  gets us the best deal. Many companies we’ve used over the years have been in it for the money only but with ADSI we feel that they really do put the customer first, can’t praise highly enough.”

    East Durham Community Transport
  • “Our account manager makes this otherwise stressful task of the comms pain free. We receive a personalised service and he is always on hand to advise us on maximising our telecoms whilst keeping an eye on budgets, all without compromising the high level of standards we have come to expect.   Because of this we have moved all our mobile needs to ADSI which goes against normal company policy where we by principle never use a sole supplier.”

  • “I would just like to thank you for all your help over the last couple of months. I admit that I was hesitant at first but the service level of ADSI, your professionalism and expertise has been second to none. I would not hesitate to recommend your services to other business colleagues I know. I look forward to our on-going working relationship.”

    AM World UK
  • “We are really happy with overall service from ADSI; it’s great to have someone assigned to our account that can help us with any issues. Our overall phone costs have greatly decreased and we are extremely happy with ADSI.”

    McCue Corporation
  • “My Account Manager is extremely good at alerting us to areas where we could potentially save money within our business. We are more than happy with the service we receive from ADSI & I would strongly recommend them to other individuals or businesses.”

    Trans XL
  • “We have dealt with ADSI now for approx. 5 years, and have been continuously impressed with the good old fashioned level of customer service. Not only do they keep their eye on our account to make sure it’s the best value for us and offer us great deals on new products, but the back-up is second to none. I would have no hesitation in recommending them to business colleagues. Keep up the good work!”

    Pink Scaffolding
  • “ADSI offer a personal service delivered in a very professional way.  I am very satisfied with the service and support provide by ADSI.  I am confident that when I call, my questions will be answered without delay and this is delivered at a very competitive price.  ADSI look after their customers be providing a pro-active service that will let me know if I need to make any changes to my mobile account.  I am free to concentrate on other aspects of my business because ADSI are looking the mobile accounts.”

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