On Sun, 4 Aug 2019 10:33:01 +0100, The Natural Philosopher
wrote:

On 04/08/2019 10:11, Harry Bloomfield wrote:
Brian Gaff pretended :
Do they not use each others resources though? I'd have thought they
might have negotiated a deal by now.

I understand if you do a 999, that can route through what ever mast it
can find, which suggests they do not share resources otherwise.

Indeed it is a mystery as to why they dont. It is also a mystery as to
why they dont use wifi calling at every possible point.
ISP always transfer tpo spmeone elses network at the earliest possible
point.

Hardly a mystery. Why would anyone invest to improve their network
then allow their competitors to benefit?