Can I use my existing SIM card from another carrier with UNREAL Mobile? June 02, 2020 20:40 Updated Follow No, you must purchase an UNREAL Mobile SIM card. But don't fret, your UNREAL Mobile SIM card and shipping are completely free when you order your first month of service. Was this article helpful? 1 out of 1 found this helpful Have more questions? Submit a request Return to top Related articles GSM Device Compatibility Check Does UNREAL Mobile allow me to bring my own phone? How do GSM Unlocked phones work? Unlocking my UNREAL Mobile Device How do I activate my UNREAL Mobile Premium SIM card?