Replying to My friend spent 400 dollars to see the Hot girl thread

So, in US History i was talking about NS, and my friend (who does not ski) asks "what is NS" So i give him the little lecture on the ways of newschoolers and he decides to go on using his cellphone. He finally gets to NSG and naturally i advise him to check out the hot girl thread. He does, and the page starts to load, after which he after which he informs me that his phone plan costs 10 cents per Kb. Now he suddenly realizes he already used 4000 Kb and he could only see half of one picture. 10 cents x 4000kb = 400 dollars. What should he tell his mom when she gets the bill?