International roaming can be as costly as 20$ per mb, so don't even try for international roaming, wherever you go, just get a local prepaid 3G sim in that country, I did the same in HK
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I second that .. dont even think about international roaming .. for data as well as call .. I remember few years back I ended up paying a bill of 25,000 with idea international roaming .. if you are going to UK , Europe or Australia try the VOIP SIM cards like Lyca Mobile or Lebara Mobile .. they use local service providers like Vodafone, for providing their network.. and use VOIP to route international calls .. they usually have 0 per cents min plans with a flag fall of about 15-25 cents .. so in $10 .. u get hrs and hrs of international talktime ... Lebara mobile also has 3G .. with amazingly low charges .. I use Lyca whenever out of country .. saves me heaps ..