Depends on whether you really need a 24/7 phone connection or otherwise require a SIM for realtime local calls.

I forward iphone calls to my google voice # which sends an email transcript to email (and also the GVoice app). I can then decide if the call is sufficiently important to warrant a call back (most aren't). I find it easy to update my email and other content at free wifi locations as well as my hotel's wifi connection. You can also return calls very cheaply through facetime or skype using the wifi connection. There are also programs that show your map location using GPS but without data charges.

Of course, none of this will be sufficient if you need to be able to receive and make calls on a realtime basis (assuming your remote office does not have wifi and you don't spend all of your time at the hotel).