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Originally Posted by scastle
I suspect the that only reason BT can offer Caller ID nationwide is that back in the late 80s, they were still converting to digital exchanges, so were having to spend £millio ns upgrading anyway. It wouldn't have cost them a lot more (relatively) to add facilities for Caller ID.
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I expect it also had something to do with contractural obligations to provide everybody in the UK with the same service, regardless of where they lived.
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Originally Posted by scastle
Of course, the original cable companies who now form NTL could have included Caller ID too (and some did).
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When Cambridge Cable set up their service there was a lot of competition, not only from BT but also from Ionica. Part of Cambridge Cable's original offer was providing the customer with line rental, the equivalent of all the BT Star Services (Caller ID, Voicemail, etc.) and TV for the same price as BT's standard line rental.