C hina Mobile (CHL) appears an attractive pick, as it has been recently upgraded to a Zacks Rank #2 (Buy). This upgrade primarily reflects an upward trend in earnings estimates, which is one of the most powerful forces impacting stock prices. A company's changing earnings picture is at the core of the Zacks rating. The system tracks the Zacks Consensus Estimate — the consensus measure of EPS estimates from the sell-side analysts covering the stock — for the current and following years. The power of a changing earnings picture in determining near-term stock price movements makes the Zacks rating system…