back in the days of managing a factory, I use Blackberry/3 mobile service.
the bloody monthly plan is expensive!!
I think unless one is a financial manager (stock brokers), there is no way I need "instant email alert".
***Blackberry notifies the user about new emails within 2minutes upon receiving it.
I then switched to Dopod 818Pro, and join Peoples Mobile's unlimited access (by EDGE) HK$120 per month.
the PDA phone has built in "push mail" function, which I can check emails every 15minutes automatically. So it is fast enough for my work requirement.
Today, I switch to iPhone (cracked firmware 1.1.1 version)
it also has EDGE/Wi-Fi function, and push mail (again 15minutes automatic check emails), still using Peoples Mobile's service.
but my phone bill is much cheaper than Blackberry.
not to mention, the iPhone's Safari internet browser is the fastest and much more stable than Internet Explorer of WM6 OS.
**however, Safari (as of any Mac system) cannot access the HK jockey club for betting horse races or football matches, and it cannot access to some of the bank system.
**it works with Hang Seng Bank