You need a replacement SIM card if:
- Your SIM card is defective or was stolen.
- Your SIM card is obsolete and must be replaced (this applies to all cards that were issued before 2002).
- Your new phone requires a new MICRO SIM card or a new NANO SIM card.
You can obtain a replacement card from any Swisscom Shop. Ask the Shop staff to assist you with transferring the contacts from your old card / your old device to your new card / your new device.