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 I’ve tested a few and am planning to put them up for sale with @BitcoinBrabant but still haven’t found ones that are optimal. We would not only use it for phone, but also for signing devices. 
 Oh and on another note. If you drop your phone or laptop in a faraday bag make sure you put it in airplane mode or turn it off before you do. If you don’t the machine ramps up power towards WiFi/Cellular to establish connection again. This drains the battery quicker.