Ericsson appears to be taking full advantage of the challenges its main rivals experienced, for different reasons, in the 5G market in 2020. A rising pace of 5G roll-out was the key driver for a growth in full year and fourth quarter revenues and profits, and for 2020, it achieved its targeted operating margin of 12.5% two years ahead of schedule. The last quarter of 2020 was the strongest indicator yet of the success of a turnaround plan, initiated at the start of 2017 by then-new CEO Börje Ekholm, that reversed a previous strategy of diversification and focused intensely on 5G and mobile networking. The narrowing of horizons may still be storing up problems for the future, particularly in the…