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Here's why I'm asking: Amazon's Echo requires a companion mobile device in order to make calls. I bought the Echo for my 92 year old mom who will never (never) use the mobile phone -- it will just stay plugged in indefinitely next to the Echo. The Citrine LTE is almost the perfect companion the Echo IF I can just leave it plugged in. What harm (e.g. fire, dead battery, etc) might result?