London Banter - View Single Post - Dual SIM phones was:Worker killed by Southern train was covering for brother

Roland Perry · July 18th 19, 12:25 PM posted to uk.railway,uk.transport.london

In message , at 19:44:43 on Wed, 17 Jul
2019, remarked:

Ones where the credit rolls over and you don't have to make a regular
calls to keep them alive, aren't quite as common as you claim. The
networks hate them because they tend to get used in "glovebox" phones
were they have all the costs of maintaining the number and the billing
records, for virtually no revenue.

Oh come on, its costs them precisely £0.00 to maintain a number, its simply
data in a database.

Ah, the marginal costs fallacy rears its ugly head.

That's even assuming there's facilities which aren't charged to the
operator on a per-number basis.

Then there's a few phones which need a "5v" SIM, and don't work with a
3v one. Those SIMs are getting harder to find (some say that it's only
Pound-shop Orange SIMs these days, although I have a very old T-Mobile
SIM which is compliant).

Never realised there were 2 types of chips.

Apparently here are three.

Presumably the 5V are the early types of SIM?

Yes, the original ones. And it seems there are few people still making
very cheap phones with [old] chipsets that are also only 5v compatible.
--
Roland Perry