Bwahh! Ha! Ha! I would like to see them enforce that, since you can get on the internet with most cell phones or game systems and most coffee shops and restaurants provide free Wi-Fi.
PS, if you don't want border guards snooping through your files, encrypt them with a freeware program such as truecrypt, which prides it's self on being virtually uncrackable and NOT providing any form of back door to governemnt or law enforcement
Encryption software goes back to wartime use (think WWII and earlier).
It is considered a ‘weapon’ of sorts and at least in the 1990s, some particularly strong methods of encryption were prohibited from import into this country.
Governments want a back door key to your files.