[dhan_shh]

O2 Xda II has WM2003 OS,

Recent handhelds mostly support WM5 and some even 'Crossbow' (WM6) after ROM update.

Crashing problem is rare in newer devices!
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Newer Symbian S60 9.1 built-in-browser is good,no doubt! But if 'Opera' is installed it makes browsing beautiful.

Symbian UIQ 9.1 devices (SE W950i,M600) have built-in Opera browsers,they are better than Nokia devices like N93,N73,E61 etc.,

Older Nokia models like 7710,9500/9300 support built-in Opera browser,

Still,browsing in WM5 needs to be experienced than explained! jus gr8!