Expand your Roaming Ability Roamability offers Mobile Operators the ultimate Dynamic Multi IMSI (DMI) Solution to provide their customers global roaming packages with the broadest, high-quality coverage, with the simplest activation. Operators of all sizes can now achieve instant roaming with the most competitive international service agreements for data, voice and text, while maintaining full control: OTA installation and full user visibility. No SIM replacement. No SIM key required. Seamless user experience.