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Many people don't realise that there are many phone providers offering cheaper calls to standard telephone numbers (those beginning with 01, 02 or 03), which don't apply to 0842, 0843, 0844, 0845, 0870, 0871, 0872 or 0873 telephone numbers.
By using multiple providers, you can reduce your call cost on standard telephone numbers to as little as 5p fixed cost (regardless of duration), whereas the cheapest provider to 0871 numbers during the day that I am aware of charges 10p/min (+ 12.5p connection fee [with BT]) to call.
Worst still some companies that use these numbers are actually receiving a cut of the phone call costs.
If you have an 'inclusive landline calls' phone package, then it is very rare that 0844, 0845, 0870, and 0871 numbers are all included in your 'free minutes' allocation, unlike normal numbers. Many mobile phone packages also exclude freephone 0500, 0800 and 0808 numbers for your bundled minutes. BT and some other companies are starting to include 0845 and 0870, but this only applies to certain packages, and does not apply to 0844 and 0871 numbers.
Many companies advertise a separate number that can be used when calling from abroad - This usually begins in the format +44 - There is nothing to stop you using this number from the UK (as it is a normal rate telephone call), and will be included in any inclusive minutes provided by your land line or mobile phone provider. Many others will give you a standard number if you ask.
This site is all about listing these numbers, saving you money, without having to pay additional charges. To get started and find a particular number, please click on the 'Search to find an alternative number' link at the top of the page.