okay guys im travelling overseas very soon and i need to have my phone active while travelling (need to keep same number)
what is the most cost effective way to recieve calls while overseas. should i have skype constantly active or is there a cheap sim provider here for roaming?
As long as you receive calls from people dialing your Australian mobile number, you will be charged for voice roaming.
You can't receive calls on your Australian mobile number through Skype. Skype also uses data connection. Unless you have wifi available 24/7, note that data roaming charges are usually $20/MB for most Australian telcos. You may end up paying much more for using skype (data roaming) than making/receiving calls through voice roaming.
Personally, I would check out the rates for pre-paid mobile broadband data packs offered by a local telco in the country you're visiting. Quite often, this is actually cheaper than any roaming options. Then use that SIM in a device similar to the pocket wifi for internet connectivity.
That way, you can turn off all data roaming on your mobile and constantly connect to your pocket wifi. Then you should be able to use VoIP/Skype to make and receive (through your skype #) calls through wifi, at the same time being able to receive important calls on your Australian number.
Good luck.