sojourner65 wrote on Oct 25
th, 2007 at 10:15am:
* Not all network operators have to allow access to these 03xx numbers. So some of your callers may not be able to get through when trying to dial the 03XX numbers. The only network operator who has to allow access is BT, i.e. only callers calling from a BT landline will be guaranteed to get through.
It is true that only BT has to allow access to 03x numbers but this also applies to all other number ranges like 08x and geographical.
Other network operators (known as OCP - Originating Communication Providers)
don't have to allow access to any numbers they don't want to and this includes 01/02, the new 03x, 084x, 087x, etc...
However, it should be noted that it's
not in a network operators interest to actually block access to numbers their customers want to ring (and this includes 03x) because then their customers will simply move to other providers instead.
None of the main landline providers (BT, TalkTalk, SkyTalk, VirginMedia, etc) block access to 03x and it's
extremely unlikely that other providers would do either.
03x is still in early stages yet and as such some mobile networks may not have setup their systems to handle 03x calls.
Also, access from abroad may not be possible at first simply because it is a new number range however once 03x is established then there is no reason why international operators would block access to these numbers. The main reason for this is that it would cost international operators the exact same amount of money to route the call back to the UK as it does for geographical 01/02 numbers.
Some international operators may block access to 0844, 0845, 0870, 0871 numbers simply because these calls cost a lot more than geographical and the new 03x numbers.