What strengths did Nokia have as a company and how have these been offset by new companies ?

Disruptive technologies: when do firm capabilities become liabilities, and vice versa?

The case would focus on the mobile phone/smartphone industry, specifically on Nokia and its demise as an established value in this industry. What strengths did Nokia have as a company and how have these been offset by new companies ? Don’t only focus on how Nokia’s strengths became a weakness, but also on how “weaknesses” of other companies became a strength.