T-Mobile USA has been the epicenter of Android since HTC rolled out the T-Mobile G1 back in October of 2008. The company continued that tradition yesterday at the GigaOm Mobilize 2011 conference, with the unveiling of its first pair of 42Mbps HSPA+ Android devices.

In a keynote address, T-Mobile’s Chief Marketing Officer Cole Brodman unveiled the HTC Amaze 4G and Samsung Galaxy S II. T-Mobile says the new smartphones, which support the next evolution of its HSPA+ network (42 Mbps), are showing average download speeds approaching 8 Mbps with peak speeds around 20 Mbps.

The T-Mobile HTC Amaze 4G, which comes running Android 2.3.4 (Gingerbread) features a 4.3-inch touchscreen, 1.5 GHz dual-core processors, an 8-megapixel camera and 1080p HD video recorder, a backside illuminated sensor for improved low light performance, zero shutter lag and a dual LED flash, as well as support for near field communications (NFC) technology.

T-Mobile also revealed additional details about the T-Mobile Samsung Galaxy S II smartphone, which is also available as the Epic Touch 4G from Sprint. The Galaxy S II from T-Mobile will come running Android 2.3.5 (Gingerbread) and features a 4.5-inch Super AMOLED plus touchscreen and 1.5 GHz dual-core processor.

Brodman took time to outline the company’s Android efforts, as reported at various outlets, noting that 75 percent of the phones T-Mobile sells this year will be smartphones, 90 percent of which will be Android phones. Brodman also confirmed at the event that T-Mobile will not be landing an iPhone next month.

The HTC Amaze 4G and Galaxy S II are expected to be available in an online pre-sale beginning Oct. 10 and are expected to be available at T-Mobile retail stores and select dealers nationwide starting Oct. 12.

The HTC Amaze 4G is expected to cost $259.99 after a $50 mail-in-rebate card with a two-year service agreement, while the Galaxy S II is expected to cost $229.99 after a $50 mail-in-rebate card with a two-year service agreement.

Brodman also unveiled the Sonic 4G Mobile HotSpot, which also supports the company’s 42 Mbps HSPA+ network for up to five Wi-Fi enabled devices. The Sonic 4G Mobile HotSpot comes equipped with an SD card slot that accommodates up to 32GB of expandable memory, enabling customers to share and save photos, documents and videos. The Sonic 4G Mobile HotSpot is expected to be available in October at T-Mobile retail stores and online.

As for that iPhone? It’s a familiar story and a familiar line from both T-Mobile and Sprint in the past. “We’d love to have the iPhone whenever Apple makes that available,” Brodman told GigaOm in an interview posted to the company’s website, adding that the ball is in Apple’s court. “We are waiting for that phone call.”

Samsung announced that the Samsung Galaxy S II has achieved 10 million global channel sales, doubling from 5 million in just eight weeks. The company also rolled out a pair of LTE-capable Galaxy S II phones in Korea.

“In just five months the Galaxy S II has seen tremendous growth, reflecting its tremendous popularity with customers around the world, who in selecting the Galaxy S II as their device of choice have driven the device’s strong market position globally,” said JK Shin, president and head of Samsung mobile, in a press release.

The Galaxy S II, a successor to the company’s original Android-based Galaxy S smartphone, is Samsung’s flagship smartphone device. It comes running Android Gingerbread and features a 4.3-inch Super AMOLED touchscreen and a 1.2 GHz dual-core processor.

What is perhaps most interesting about this milestone is that it did it with little help from the United States. The only Galaxy S II model available in the U.S. right now is the Epic 4G Touch from Sprint, which launched on Sept. 16.

Samsung is currently embroiled in an ugly legal battle with Apple, which claims Samsung’s Galaxy devices infringe on its UI and design patents. Just last week, Samsung was ordered by a judge in Germany to stop selling the Galaxy Tab 10.1 in that country.

Sprint and Google announced the rollout of Google Wallet to all Nexus S 4G customers, an app that enables consumers to transform their phones into their wallets and make purchases by tapping their phones at the point of sale (POS).

Sprint is the first carrier and Nexus S 4G is the first phone in the United States to deliver Google’s solution. The new service currently only works with Citi MasterCard accounts and Google Prepaid MasterCard and is available at “hundreds of thousands of participating retailers, including American Eagle Outfitters, the Container Store, Macy’s, Foot Locker and Subway,” according to a press release.

Google Wallet requires users to set up a Google Wallet PIN that must be entered before making a purchase to prevent unauthorized access and payments.

“Shipping Google Wallet to Sprint is a crucial first step in creating a new way for people to use their phones to make shopping faster and easier,” said Osama Bedier, vice president of payments at Google, in the press release. “The world is on the brink of the next big shift in payments, and today’s announcement demonstrates that we’re making real progress in attaining the vision we share with our partners for a new and innovative mobile payments platform. We believe this is just the beginning of a transformation that’s soon to come.”

Eligible Sprint Nexus S 4G customers will be prompted to download the latest version of the Android software. Once this download is complete, customers can launch the Wallet app to try it.

Google said yesterday that it will add additional partners to its Mobile Wallet service in the near future. The company has received NFC specifications from Visa, Discover and American Express, meaning users will be able to add those cards to their mobile wallet soon.

Sprint has teamed with Google in deference of signing on with Verizon Wireless, AT&T and T-Mobile in the ISIS initiative, which also aims to enable NFC-based mobile payments. ISIS promises trials in limited markets by mid-2012.