On 25/10/2019 14:20, Dave Liquorice wrote:

All texts go via your service providers message centre, this has a
number that varies by service provider and occasionally tarrif from a
given SP. It's normally set by the SP when you register the SIM but
can be chnaged manually
All telephone calls have to go via your mobile provider, so why do text
messages need a special message centre with a special number?

--
Max Demian