[rogerbinns]

But see Australia was already starting with variable length numbers. NANPA started in the late forties. It is obviously possible to change things, but would require extraordinary effort. For example every computer program knew that NANPA numbers were exactly 10 digits since every program was written after NANPA came about. Having to change all of them would make y2k look trivial!

Something being missed is that callers are still charged to reach your phone company at the base rates - that is not free to them. You then pay your phone company extra for how you connect to them. Abuse is a red herring. When I go to other countries and get a local SIM I get inundated with SMS, which doesn't cost money but sure does cost a huge annoyance. SMS spam is very rare in the US, with the carriers cooperating to stamp it out and always refunding people for any.

[stephenr]

> SMS spam is very rare in the US

The only sms "spam" I have seen.. I think ever, having had a mobile phone in Australia for ~13 years and now Thailand for about 2 years, is messages from the network operator (and its sister companies), here in Thailand. In Australia I don't remember ever getting "spam".

My point was not about "professional" spam, it was about the potential for personal abuse. Someone posted in the thread earlier about racking up $~200 of sms charges against a friend's ex girlfriend.

[rogerbinns]

And that ex-girlfriend would have been able to get the charges reversed plus legal recourses. It is considerably easier to do that when you show you incurred real costs, versus when receiving them is "free". The phone calls to your carrier customer service cost them money too so they are keen to reduce those.

Try India sometime for SMS spam.