Android 12 Developer Preview is here! Try it out, and give us your feedback!

Telephony IDs

Android devices with SIM cards and eSIMs use the following IDs in the telephony APIs, including TelephonyManager and SubscriptionManager:

  • Subscription ID: unique ID for a mobile subscription.
  • Slot index or slot ID: unique index referring to a logical SIM slot. Slot IDs start at 0 and go up depending on the number of supported active slots on a device. For example, a dual-SIM device typically has slot 0 and slot 1. If a device has multiple physical slots but only supports one active slot, it will have only the slot ID 0.
  • Card ID: unique ID used to identify a UiccCard.