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Number change, no.
Cost? yes.. you will need to sign up to a new contract.
One thing to consider if you will be spending some considerable time overseas... neither Telstra or Optus have networks overseas, so you will be roaming onto someone elses... like Orange or O2 or .... 3
This is more expensive... and if someone calls you... YOU pay for it.
We have 3 in Australia, I'm with them for this reason:
3 has networks in the UK (nice for me.. Scotland in a few weeks) and... nice for you.. Italy
With 3... in Uk and Italy(and a few other places) you are in a 'Like Home Zone'.. that means you pay the same for your phone calls and text messages as you would on their network in Australia.. and, even better, if anyone calls you.. it's free... which means caller pays.
Data(Email/internet) however is not covered by 'Like Home' so is charged at $0.50/MB... so yes.. hunt down those WiFi hotspots!
Another thing worth considering, if you are away for some time, is getting prepaid from an Italian provider, (I went with Alice when I was there) and text everyone your new temporary mobile number.
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