It would be nice if it would integrate with a 3G/4G dongle. Huawei dongles (maybe ZTE as well?) already have an HTTP endpoint to get SMS and also their USB dongles have no battery, so it is much safer to leave it plugged into a wall 24/7 than a phone.

Most phones these days do have battery charging cut off, so they should be safe but still prefer to have one without battery for leaving it plugged in 24/7.