Best answer: No. At present, there is no configuration of the Pro 6 with LTE. If you need an LTE Surface Pro, the excellent Surface Pro X is now available. If you want something cheaper, consider the HP Envy x2 or the Surface Go LTE.
Why no LTE?
There's no reason why the Pro 6 might not pick up an LTE option down the line, but Microsoft hasn't said anything about future plans. As seen with the Surface Pro 2017 model, an LTE option was announced at the outset and emerged for sale a few months later.
We can understand why a company would be hesitant to add LTE. The downsides are in the way the LTE modem can impact internals. The space required to fit in the LTE components meant that the Pro 2017 LTE was restricted to a fanless Core i5 processor, and similar design challenges may be present in the Pro 6.
Microsoft circumvented these issues with the new Surface Pro X by leveraging a new custom chipset dubbed Microsoft SQ1, based on ARM's architecture. This brings LTE by default, complete with an even slimmer design.
The Surface Pro X has LTE by default
The Surface Pro 6 might not have LTE, but if you desperately want an LTE 2-in-1, Microsoft's newly announced Surface Pro X comes with it as standard. While it doesn't come with the keyboard cover or stylus, it should sport comparable performance to the Pro 6, owing to its custom-designed Microsoft SQ1 chipset.
The best Surface Pro with LTE
The Surface Pro X is a powerhouse of a 2-in-1 tablet, and it now comes with LTE as standard owing to its ARM internals. Complete with fanless, always-connected design, the Surface Pro X also sports the full power of Windows 10.
HP Envy x2 for that always-connected experience
If you still find yourself longing for a cheaper 2-in-1 LTE experience, the HP Envy x2 is another excellent option. Powered by ARM, the HP Envy x2 boasts a ridiculous 22-hour battery life, perfect for long sessions away from Wi-Fi or power outlet connectivity. The Envy x2 also comes with a stylus for inking on the move, and a detachable keyboard cover, both of which Surface Pro products tend to sell separately. It's certainly not as powerful as a full Intel PC, but if portable productivity in your bag, look no further.
For more information, see our comprehensive review.
Cheaper Surface alternative
Portable power in an affordable package.
If you want a 2-in-1 Windows 10 convertible with all the benefits LTE brings, look no further than the impressive Envy x2 from Microsoft. With a ridiculous 22-hour battery life, the Envy x2 is the perfect PC netbook-style experience for those who want to be free of cables, a desk, and even a Wi-Fi signal.
Surface Go LTE as a budget option
For what it lacks in raw power, the Surface Go makes it up with massive portability. The pint-sized PC is almost small enough to fit in your pocket — coming in at 10 inches and weighing 1.17 lbs. The Surface Go LTE has a slot for a SIM card, letting you take the power of full Windows 10 on the go. It's primed for an update, though, so you may want to wait until the Spring of 2020 when Microsoft is expected to announce a new model if you don't fancy the Pro X.
4G and go
4G on the move
The Surface Go isn't the most potent PC out there, but it's one of the most portable. 4G capabilities extend its mobility even further, freeing you from the limitations of Wi-Fi.
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