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Yes, to switch to 4G requires new hardware. The 4G module we are using is the Digi Xbee3 LTE-M module – which is both more expensive and more finicky than the 2G unit. I’ve never seen any bulk discounts offered on the Digi website or through any of their suppliers. We’ve been buying them in small batches as we need them. They’re usually in stock through a number of US suppliers. We’ve toyed with the idea of developing our own LTE board, but we haven’t pursued it.
As for selling the 2G unit – if you can find a buyer, that’s certainly better than trashing them. The death of 2G is imminent in the US (and I think Canada) but it’s not gone globally.