When does my Mint Mobile service start? Your Mint service starts from the time that you activate your plan. Mint Mobile SIM cards and eSIMS can be activated up to 45 days after you receive your SIM. Was this article helpful? Yes No RELATED ARTICLES How do I activate a Mint Mobile plan with eSIM? Should I cancel my existing service before I transfer my number to Mint Mobile? How do I back up my phone?