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Yes your US sim will work in Australia but you will get high roaming charges. That roaming charges will depends on your service provider. If you want to avoid the roaming charges in Australia means you need to unlock
your phone with current network provider. To unlock your mobile visit http://www.theunlockspot.com/supported-phones/rs10wp7/ .
you can use US sim in Canada only if the phone in which you
are going to use your sim is unlocked . if its locked
to any network provider you cant's use unless you unlock it .To unlock mobile phone visit Onlinegsmunlock.com .
Do you mean what is unlock?. If it is yes mean i will explain here. unlock is nothing but removing the network restriction from your phone. Nowadays Most
phone comes with locked status due to this it won't accept any other network unless you unlock it .There are many ways available to
unlock phone from network lock. .Among
them i would say unlock code is the best one.If your Phone is an old model phone ,you can use free unlock code and
unlock it..But if your Phone is latest Phone or I-phone you cannot get
free unlock code or service to unlock it.You need to pay for getting
unlocking service.You can buy unlock code for all latest phones at wickedunlock.com and unlock it.If it's an I-phone get remote unlock service there and unlock it easily.
Unlock code is best way to unlock mobile phones from network lock.What
is mobile phone brand and model ?If your Phone is an old model phone
,you can use free unlock code and unlock it..But if your Phone is
latest Phone or I-phone you cannot get free unlock code or service to
unlock it.You need to pay for getting unlocking service.You can buy
unlock code for all latest phones at Mobile-unlocker.com and unlock it.If it's an I-phone get remote unlock service there and unlock it easily.
Customer support service by UserEcho
You can use your simcard in Israel before that make sure that your phone is unlocked. If it is locked means you need to unlock your mobile to use your simcard in Israel. To unlock your phone visit this site mobileunlocksolutions.com .