Convertible or Windows tablet with LTE for less than 500 euro?

I'm looking for a convertible (2-in-1 notebook) or a tablet (with keyboard and Windows), which offers 8GB Ram, an SSD (size does not matter), full Windows 10 and very important: LTE (SIM card slot) . The display size should be larger than 10 inches (next problem) …

I can't find anything in this price range - can someone help me? Or is it simply not possible to find a device with such specs for less than 500 euro?

My girlfriend paid for 1400 euro and the laptop is weak and slow anyway. 2-in-1 notebooks other than Microsoft tablets (and not cheap ones) are very weak and just a waste of money.

I know - but I didn't ask that.

As far as I know, the cheapest laptops with LTE start from somewhere 850 euro.

Should be HP.

LTE is more like a business. And that costs money.

Lenovo IdeaPad D330 is cheap