The Microsoft Surface Pro is now available with built in 4G as an option. Just grab an extra shared sim card and no more need to worry about shared Wi-Fi or hotspot when you're in and out of the office. This has been available on the low powered Atom based Surface [Standard] previously but this is new for the Surface Pro which is a full powered PC just like a laptop. (12.3" screen)
Although Surface starts AU$1,199.00 inc GST, sadly it's only the at AU$2,199.00 model that has 4G for now. (Special pricing for eligible students, parents and teachers is available on all models).
https://www.microsoft.com/en-au/surface/devices/surface-pro/overview