I got one of these (or a very similar model), they are sold as "Cardphones" on eBay. Really nice backup device, battery lasts weeks, reception and call quality

I got one of these (or a very similar model), they are sold as "Cardphones" on eBay. Really nice backup device, battery lasts weeks, reception and call quality is surprisingly good. I only wish there was an easy way to sync the phonebook to Android/iOS because the interface is really, well, basic.