Its applicable almost everywhere. But its applied "too much" in Pakistan than other countries.
Google "Law of Supply and Demand" and "Elasticities of Supply and Demand" and then you will know what I am talking about.
Internet and electricity are two different things.
Electricity is a necessity, so it has inelastic demand, its demand will decrease very slightly if there is increase in prices. There are also no cheaper alternatives available for electricity.
Internet is not a necessity, so it has elastic demand, its demand will decrease more if there is increase in prices. Cheaper alternatives are available, so people start to look for cheaper alternatives, as you can see lots of examples in this thread of it.
+1, Excellent. Very well said.