Cheaper Roaming and Local phone calls

Singtel 019             Australia-$0.19c/min, China-$0.22c/m, Malaysia-$0.13c/m,USA-$0.15/m 
M1 021                 Australia-$0.31c/min, China-$0.57c/m, Malaysia-$0.22c/m,USA-$0.28/m 
Starhub 018           Australia-$0.08c/min, China-$0.08c/m, Malaysia-$0.08c/m,USA-$0.10/m 
                             *All above local ISP additional 16c/min mobile airtime

Skype.com            Australia-$0.04c/min, China-$0.04c/m, Malaysia-$0.04c/m,USA-$0.04/m
                             *3G charges plus 6.4c connection fees 

Pfingo.com Talk    Australia-$0.074c/min, China-$0.02c/m, Malaysia-$0.06c/m,USA-$0.04/m 
                            *3G charges as you talk

PfingoBounce.com  Australia-$0.099c/min, China-$0.045c/m, Malaysia-$0.085c/m,USA-$0.065/m 
                              *3G charges to activate call-back

Hoiio.com             Australia-$0.084c/min, China-$0.049c/m, Malaysia-$0.10c/m,USA-$0.045/m 
                              *3G charges to activate call-back

Truphone.com
Fring.com
Nimbuzz.com