A potential combination of Sprint and T-Mobile is seen as the most compelling, with the likelihood of a deal between the two wireless carriers now at more than 35 percent, up from 10 percent in September, with a 70 percent chance of approval, if announced, JP Morgan analyst Philip Cusick said.
Japan's Softbank, which owns more than 80 percent in Sprint, had pledged investment in the United States last year, reviving speculation that Sprint and T-Mobile may rekindle merger talks.
JP Morgan upgraded Deutsche Telekom, which owns almost 65 percent in T-Mobile, to "overweight" from "neutral" and raised its price target to 19.50 euros from 16.20 euros to reflect a 35 pct probability of a U.S. transaction.
"We believe that parents Softbank and Deutsche Telekom have increased their preference for a tie-up in the last six months and that the value of about $5 billion of annual synergies is enough to smooth over most disagreements on relative value," Cusick said.
Deutsche Telekom Chief Executive Tim Hoettges said in November that the company was "not in the mood" to sell T-Mobile, although it was watching for any change in the U.S. regulatory environment under Trump's administration.
Cusick estimated a 20 percent chance of T-Mobile continuing to operate as a standalone business in the next five years.
Shares of T-Mobile closed at $59.62 and Sprint at $8.93 on Friday. Deutsche Telekom shares closed at 16.42 euros.