Dear @kjm, @kjm said in lte.deinit(dettach=False) with machine.deepsleep: We've found it's not a good idea to routinely reset the modem in battery powered/deepsleep applications. If the modem is not reset attachments take only a second or two but after a modem reset they take 3-4 times longer. Sure. Sorry that I haven't told you that we are currently not using the modem at all and just want to turn it off as quickly and thoroughly as possible. When actually using the modem and going to deepsleep, it should probably not be reset and detached so it will keep its association with the cell infrastructure. Thanks and with kind regards, Andreas.