When does my Mint Mobile service start? Your Mint service starts from the time that you activate your plan. Mint Mobile SIM cards can be activated up to 45 days after you receive your SIM. Was this article helpful? Yes No RELATED ARTICLES How do I remove and insert a SIM card on Android? How do I activate a SIM card and bring my current number to Mint Mobile? How do I remove and insert a SIM card on iPhone?