Ya.It's possible to unlock your Blavkberry curve8530 mobile from telus network using code .To get code visit Superunlockcodes.com here you need to specify your IMEI number of your phone.Then they deliver unlock code to you.After unlocking your mobile you can use any GSM network sim in it .
yes, you can use your Samsung propel mobile with different network sim in all countries only if it is unlocked. Otherwise if it is locked to any one network then you must unlock it first to accept other network sim. To unlock visit Theunlockarena.com here you need to specify country and network...