Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not for the Iphone 4 or 4s at least

This screwdriver does not work for the Iphone 4s at all. This screwdriver should be sharper. I bought it thinking that I was going to be able to fix my Iphone 4s, and now I might have to buy another time another screwdriver. The shipment was great, though.