Does the Travelnroam SIM have a PIN lock?
Yes, by default it is 1111. However, it is possible to lock your Travelnroam SIM by entering the wrong PIN number 3 times or more. If this occurs, please contact Travelnroam Customer Support to retrieve a PIN and PUK code for your Travelnroam SIM. Your PIN number, as well as the PUK number (PUK stands for Personal Unblocking Key), is printed on the credit card sized piece of plastic you received your Travelnroam SIM card in.
Yup the carrier will be locked to the phone which we take to other countries.. that pin which is used to unlock carrier can be purchased from any commercial vendors online like http://www.unlock-zone.com