Well, I am in Mexico and I don't install anything else on the phones, on the last version (1.1.2) you needed to install iworld, otherwise the phone will crash if you tried to dial, or get some problems taking calls.
I have read different opinions on the forums, but my phone and arround 10 more I have fix with version 1.1.3 are working just fine here in Mexico with out any patch
If you go to iclarified sourse there is a AppSupport patch for version 1.1.3, it is suppose to fix Dialer crashes and Caller ID for those in other countries, I just install it and my phone is still working fine, so I guess you can play it safe and install it.

(maybe ot gives problem in other countries)
Does some one in other country can give us some input?
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