My strategy has always been to know the user and their behaviors including everything that they are conscious of or sub consciously aware of. We did a complete evaluation of how products are perceived, how accessories are viewed, what would be the attention span of the product on the shelf, how would communication be useful if it was implied were some of the questions we asked ourselves.
To also delve deep into our consumers, looking at brands and spending trends gave us a lot of key demographics which were extremely useful. Also some other info i was looking up has given me a great insight into just the iphone market.
Here are some great stats related to the mobile industry i ran into as well on the internet just to give you an idea of what an expanding research market this would be.
Finally please take my product survey with which i can ascertain some true input from the actual consumers.
http://www.surveymonkey.com/s/9T3BLJX