What is the minimum age to sign up a plan with Grid Mobile? Admin August 16, 2019 06:58 Updated Follow You have to be at least 16 years of age to sign up using your own ID. Related articles What are the documents Grid Mobile accept upon signing up? Do I have to sign up a 12 or 24 months contract? When can I terminate my line? How many lines can I sign up under my ID? Are we allowed to terminate the Free SIM/Buddy SIM without terminating the main line? Comments 0 comments Please sign in to leave a comment.