After you have purchased your Altice Mobile sim card, the next thing is to activate the new sim card. To complete your order, make sure you have the phone(s) to be used with the new SIM card(s). Below are steps to activate your sim card and get your phone up and running.
How To Activate Altice Mobile Sim Card
Sign in to MyMobile.
Click on Activate SIM card. You can only do one at a time.
Insert the SIM card into the phone.
Verify that the phone is running on the latest operating system.