Whats this about dialling a prefix before the number, to be billed by a different telco?
This can be done by manually dialling a prefix number or by installing a “box” which adds the prefix number automatically, a process known as Least Cost Routing (LCR). BT are required by Oftel (now Ofcom) to make their network available to other operators to provide this service – but BT are the only ones so required. Cable & Wireless, the cable companies and others don’t have to enable it. Whether you save money depends on discount levels and usage, and needs to be carefully calculated. You must also ensure that you will get an acceptable level of back-up service should anything go wrong – businesses rely on their phones more than residential customers, so you need an appropriate level of service. See also carrier pre-selection (CPS).
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