Hello, The IWD project now has a need for SIM card access in order to authenticate to EAP-SIM/AKA WiFi networks, and will be using ofono for this functionality. In order to do this, the GSM/3G "authenticate" algorithm needs to be run on the (U)SIM. For this I am proposing a new interface: "org.ofono.SimAuth". I do have a few questions about what method(s)/interfaces would be preferred. Since 2G/3G take different inputs/outputs there are few possibilities: 1. Two different methods on org.ofono.SimAuth: AuthenticateSim() Input: "ay" RAND Output: "ay" SRES, "ay" KC AuthenticateUSim() Input: "ay" RAND, "ay" AUTN Output: "ay" RES, "ay" IK, "ay" CK, "ay" AUTS 2. One method on org.ofono.SimAuth, with more complex arguments e.g. Authenticate() Input: "s" type, a{ay} args Output: a{ay} This would return take in and return the correct arguments for 2G/3G based on the "type" argument. 3. Separate interfaces for SIM/USIM (e.g. org.ofono.SimAuth and org.ofono.USimAuth). This would also allow the client to see if either SIM or USIM are supported before making any method calls. If anyone has input on what would option would be preferred, or maybe a different way of doing it, that would be great! Thanks, James