Here we go again. T-Mobile USA, the nation’s fourth-largest carrier and the only major U.S. telco without Apple’s iconic smartphone, should finally land the latest iPhone early next year, if an analyst with Morgan Stanley is to be trusted.

This isn’t the first time analysts made such an estimate and the carrier on its part has been appeasing to its iPhone-totting customers with free support to unlockers, Nano SIMs for the iPhone 5 and a broad marketing push to sell Apple users to its unlimited data plans

Lance Whitney, reporting for CNET:

The carrier could “announce official iPhone distribution in early 2013,” according to Morgan Stanley analyst Nick Delfas. The analyst provided no further details but said that such a deal would add another one to two million buyers of the iPhone 5 in the first quarter.

Such a deal would also serve as a catalyst toward higher sales.

Apple sold five million iPhones during its opening weekend and Morgan Stanley analyst Katy Huberty estimated the company may have sold 25 million iPhone units in the third quarter.

Apple is due to deliver its quarterly earnings report next Thursday, October 25.

Now, T-Mobile’s refarmed network first rolled out in Las Vegas, Seattle, Washington, DC and the New York metropolitan area. As of late, T-Mobile has brought its iPhone-friendly HSPA+ network to Kansas City

Airportal.de has an interesting map showing us T-Mobile’s 3G/HSPA coverage on the 1900MHz band in the United States, crowdsourced from iPhone owners.

Though T-Mobile refrained from using Apple or iPhone names in its ambitious “Unlimited & Unlocked” campaign, it will continue to offer support to owners of unlocked iPhone customers.

And because it won’t begin deploying 4G LTE before next year (they pledged to invest $4 billion into it), the carrier’s been busy upgrading the 1900MHz network in metropolitan areas, which allows the 1 million+ unlocked iPhone users it already serves on its network to browse at 3G and HSPA+ speeds.

Previously, iPhone users on T-Mobile’s network were only able to connect at sluggish EDGE speeds due to frequency incompatibilities.

T-Mobile’s parent company Deutsche Telekom announced earlier in the month intentions to combine its U.S. operations with MetroPCS, the nation’s fifth-largest carrier, in a move to grab Sprint’s prepaid market share.

Sprint, the nation’s #3 telco, responded by agreeing to sell 70 percent of its shares to Japan’s SoftBank in a transaction valued at $20 billion.