Boost mobile sim cards can only support boost mobile phones and some black berry phones, if you want to try you can call the customer care and have a phone swap performed.
Call the boost customer care and tell them what happened and they will unlock it for you, or they will give you the code to unlock the phone :)
If this is your first time to access your voicemail, your default password is the last 7 digits of your mobile number. If you have changed it and forgot it, call the boost mobile customer care and they will reset the PIN for you back to its default PIN.
You can check your pin for boost mobile, call the customer care, of course if you don't know your PIN they will ask you for a security question, the one you set up when you activated your boost mobile phone. Then they will send the PIN to your phone via text message.
Call boost mobile customer care and tell them you want to change your phone number, they will change it for you for free for the first 3 times that you tried to change your number, and they will charge $10 after the 3rd time..