Company details for Callsure Numbers

Callsure Numbers

  • 0175 (Display number) 01753 624121
36 Duncroft
Windsor Berkshire SL4 4HH United Kingdom

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About us

With many years’ experience in the telecoms industry, Callsure Numbers offer a unique number porting service that has been successfully utilised across multiple businesses and organisations throughout the UK. 

Based in Berkshire, our company understands how confusing purchasing a telephone system can be, which is why we offer a simple and reliable solution that has benefitted companies across a broad range of industries and sectors.  Our number porting service allows for clients to keep their existing phone numbers if and when they move premises and reduce their current phone charges greatly.

Here at Callsure, we can ensure a creative, out-of-the-box solution unlike anything else on the current market.  We provide outstanding value for money and will never sell our clients services that they do not need.  Our service is personal, practical and efficient, and has resulted in numerous happy clients over the last 15 years of business.  We work alongside various trusted manufacturers who specialise in a wide range of products and hardware including VoIP handsets from companies such as Siemens, Panasonic, Cisco, Snom and Yealink.  We take great pride in our cost-effective solutions and continue to expand our services worldwide.

Since establishment, we at Callsure have delivered exceptional service to hundreds of clients, converting spare phone numbers to a lower cost service and allowing customers to pay as little as just £4 a month.  Our number porting service is available for multiple brands including BT, Energis, Virgin Media and various other providers.  We can even port Skype numbers for a vast array of major UK cities including London, Birmingham and Manchester.  We deal with single line requests, multi-line requests, simple DDI requests and complex DDI requests, and are more than happy to deliver in-depth advice and support wherever we can.

Our company offers an extensive range of features when it comes to our telephone services, some of which include call whispers, call queues, hunt groups, voice menus, call forwarding, calls to multiple phones, caller ID routing, PIN access routing, call barring, call management plans, time of day routing, calendar based routing, caller ID numbers, call hold, call transfer, conference calls, multi-location support, multi-desk support, voice prompts, welcome messages, voicemail, in queue messages, call recording, music on hold, online control panels, divert destinations, VoIP hardware, online invoices, payment options, minute bundles and call logs.

We at Callsure also specialise in a UK city fax-to-email service, international fax-to-email, free fax-to-email, email-to-fax and UK non-geographic fax-to-email.  We are widely recognised as the UK’s leading provider of bespoke number porting and telephone services that are utilised across many different businesses. 

Whether our clients are looking for advanced call forwarding, super call VoIP, live receptionist services, cordless VoIP handsets or other telecom services, our team of professionals have enough experience and knowledge to provide excellent service from start to finish.

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Latest Reviews

Callsure Numbers

All staff very helpful and troubleshot my needs. Good communication throughout. Very pleased with my product.


Callsure Numbers

Absolutely fantastic service and gave me some great advice about how to solve a problem regarding my landline number. I wouldn't hesitate to use callsure again in the future and would recommend them to anyone. Thank you again.


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