Apple iPhone dominating the mobile industry and blackberry declining in popularity and sales

Show knowledge and understanding of the subject. Need to find theories relating to the topic. Use books or journals. Must be uk based book or paper.

Anything relating to the uprise of the apple iPhone 4s. And decline of blackberry. Must be about sales / marketing side of the business.

Objective is to find out why apple has gone bette in business an why blackberry has declined.

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