Unihertz is a fan of extreme devices; it delivered the world’s smallest rugged smartphone, the Atom, and last year, an Android smartphone with a keyboard, the Titan, that wouldn’t have easily passed for a BlackBerry (remember these?).

Now is the turn of the Atom XL which is billed as the smallest DMR walkie-talkie rugged smartphone. DMR stands for Digital Mobile Radio and is “limited open digital mobile radio standard” pioneered by the European Telecommunications Standards Institute (ETSI)”.
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https://www.techradar.com/reviews/unihertz-atom-xl-rugged-smartphone