Overview: Designed for testing & using those cell phones that will only boot with a SIM card inserted Perfect for using on a secondary cell phone GSM SIM cards (works on 2G/3G GSM phones) Read-only, non-writable (at least not via typical means) Does not actually work with any cellular operatorscommunity tools Specifications: Dimensions: 0.98 in x 0.59 in x 0.03 in Weight: 0.35