I did used to charge my Nexus One on my RT-N66U and it worked fine. Might not have been drawing as much current as an iPhone however. And with Apple, who knows what weird requirements their phones might have to accept to charge over USB...
Iphone5 charges just fine on 68U via USB2.0, just tried it out of curiosity.
No problems. Not sure how long would it take to get it fully charged or if that would in any way impact the 68's performance... but it works!