The cellular solution is pretty slow compared to a broadband connection, I doubt he would favor it when he returns home. If you could get a cellular hotspot at a reasonable price and no contract, it might be an option. As I mentioned earlier many smart phones have a tethering option that might be an alternative.
I'd check with the facility in advance regarding any wireless device as some forbid them as they can interfere withe their medical telemetry.
A lot of truth in this as well as having sometimes difficulty in getting any signal if you're dealing with a larger building or if he's way inside.
Another options that I used in the past when my daughter and wife had to stay in the hospital long term was to use the built in laptop phone modem on the existing hospital phone line. (assuming there is still a phone modem in the laptops these days).
For example, I still have an AOL account (free). AOL still has a fleet of dial up modem connections out there in most cities and some rural areas. Most run at 26-32Kbps, and occasionally can get to 56K. Surprisingly, some simplified webpages and email clients can run reasonably well, AK on a dial-up I don't remember well but probably isn't too bad. Anything would be better than nothing. Getting an AOL account is easy and free.
I also have ATT DSL and they allow you to use ATT modem's as well as wifi.
http://www.att.com/esupport/article.jsp?sid=KB400213&cv=801#fbid=P44RCBgXaVH
http://access.web.aol.com/accessnum/?country=US&state=IL&city=Chicago
AOL Access Numbers
Last updated: Wed Apr 27 11:58:48 EDT 2011
Country code: US
Country code prefix: 1
Area code: 312
City State Number Network Modem Type
Chicago IL 312-252-0271 AOLnet V90/K56+V92
Chicago IL 312-546-4265 AOLnet V90/K56+V92
Franklin IL 312-984-1581 AOLnet V90/K56
It does tie up the line but at the same time, if he's not expecting much in the way of calls, the line's not being used much anyway. Once you program the modem to get an outside line, and then dial a hopefully local call modem, hookup is usually easy. Be sure to get him a very long phone cord so he could use the laptop at some distance from the phone outlet. At one point, I actually taped down a phone line in our hospital room so nurses wouldn't trip on it as it crossed the walkway.
NB: some digital phone systems used in organizations may not work well with an analog modem, so testing is important to see if it will work.
Now on the other hand, a month to month smartphone (like with T-mobile or MetroPCS might make a lot of sense since it would allow direct internet access via cell and if AK is the primary, it really isn't using a lot of data. Downside is the small screen. But he could end it when he gets out and sell the phone if he doesn't want to keep it.
If he had an iPad with cell/wifi, that would probably work best, but the carriers supporting iPad phone service want long commitments.
Maybe someone could lend him an existing smartphone for a few weeks or months? Or add him onto an existing plan for what, $10/line plus the data package? AT&T will literally give him an Apple iPhone 3GS (what I use now) for .99 and there are plenty of other free smartphones too.
Just a few other ideas.