How do I activate my new SIM card? You will simply dial 555 to activate your new SIM. This is so it will be automatically activated on Digicel's network and you can start using Digicel's services right away. Related articles How and where can I have my SIM card registered? Why should I register my SIM card? How and where can I do a SIM replacement? How do I activate a plan? How to set a Passcode on an iPhone?