Make sure the format of your SIM card is compatible with your phone. For this, consult the specifications of your phone via the configuration tool of your mobile (section "View device specifications").
To install your SIM card into your phone, insert the card into the designated port on the side of your device (iPhone) or next to the battery.
Once the SIM card has been inserted, change the PIN code in the options of your phone.
Before you change your SIM card, find out which size is compatible with your phone by consulting your phone's specifications via the configuration tool of your mobile (section "View device specifications").
Come and pick up your new SIM card at a point-of-sale or order it on 800 777 77. Your SIM card will be sent to your address and you simply have to call 800 777 77 to activate it.