The term unlocking can refer to two different actions depending on what you are looking to do with your phone. The first unlocking action refers to the unlocking of your phone's keypad to gain access to the 'home' screen. The second unlocking action would allow your phone to accept multiple networks from one handset by unlocking the network setting. If you have forgotten your personal password for your phone's keypad then you will need to contact your network and pass security for your network to then unlock your phone. The contact details for your network provider depends on the network your phone is on (for example AT&T in the US or Vodafone in the UK) and you will need to use your preferred internet search engine (Google or Yahoo etc) to search for telephone number of the Customer Services department of your particular network. Once you have this number simply call them and tell them that you cannot unlock your phone. The network can then ask you some security questions before resetting your phone, allowing you to change your personal password. If your question refers to the unlocking of your phone in order to gain access to multiple networks then the process is similar. In order to unlock your Samsung phone you would typically need a code that will allow the handset to accept any network. This code is usually referred to as a 'master code' or 'network code' and can be obtained by your existing network provider. Occasionally your request for this will be denied, as the giving out of these codes usually coincides with a move away from the network. If this is the case then you may need to go to a shop, or look online, for a company that specialises in unlocking phones and pay for the service.
