I bought this more for PC / games console repair rather than for mobile phone repair. The range of bits is suprerb - there are 98 including many formats that cost you £1-£2 each if you buy separate screwdriver. In particular, there are hex, 6 point star and star with hole, triangle, and tri bits. Then there are the standard flat and cross head bits, and a whole range of unusual shapes that will probably get less use but at least I shoudl be coevere for every screw I meet in the future. They seem to be solidly built, I've undone a few tight screws and the bits survived.
The rest of the pack is of less use to me, but it comes with a magnetiser/demag, a magnetic screw placement board to keep track of small screws, and various shims and prise tools for removing phone screens and so on. A decent set for a good price.