I really dig my 2520. Different strokes for different folks I guess. With the latest upgrade to the 10-ish Start, it is almost the same UX as my laptop so I am not schizophrenic when switching between devices. The battery life is phenomenal and it charges stupid fast. With Office 2013 for life it was a heck of a bargain.
But all that interpersonal razzing aside, there are many tablets now with a SIM tray.
@cesarg Some more parameters would help us guide you... Screen size? Budget per tablet? Need pen support? Dockable keyboard? Anything else? Most Important: WHAT CARRIER does it need to be on? (Have you checked your carrier if you have a business plan?)
FWIW The Dell Venue Pro line is pretty widely liked, Toshiba Encore Write series as well. Many like HP's offerings in tablets lately. It truly is sort of wide open unless you help narrow it down.