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 What is the Short Code for SIM card registration? How and where can I have my SIM card registered? How does a SIM card expire on Digicel’s Network? What happens after I replace my SIM card? How to keep my SIM card from becoming a Junk?