- Designed for testing and 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 operators                                                                                                                                Dimensions: 0.98 in x 0.59 in x 0.03 in<br />Weight: 0.35 oz