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The final piece falls into the puzzle as AT&T becomes the fourth major US wireless carrier to announce plans to offer the Samsung Galaxy Tab 7 inch Android tablet.

AT&T will begin selling the Tab on November 21st. The company is offering Pay-As-You-Go data plans, starting at $14.99 per month for 250GB of data or $25 per month for 2GB. The tablet will run a whopping $649.99 since you don’t get the kind of subsidy that usually comes along with a service contract.

US Cellular has also announced it will begin selling the Galaxy Tab on November 19th for $399.99 after rebate when you sign up for a contract, or $599 without a contract.

So to recap, here’s where (and when) you can get a Samsung Galaxy Tab in the US:

Already shipping:

• T-Mobile: $399.99 with $24.99/month for 200MB or $39.99 for 5GB
• Verizon: $599.99 without contract, monthly plans starting at $20 for 1GB
• Sprint: $399.99 with $29.99/month for 2GB or $59.99 for 5GB

Coming soon:

• AT&T: $649.99 without contract, $14.99 for 250MB or $25 for 2GB
• US Cellular: $399 (with contract) with $14.99/month for 200MB, $54.99 for 5GB / $599 without contract

The Samsung Galaxy Tab has a 1GHz Samsung Hummingbird processor, a 7 inch, 1024 x 600 pixel capacitive touchscreen display, Google Android 2.2, and a 3G modem. It’s one of the few Android tablets that ships with full access to the Google Android Market. It also runs Samsung’s custom software including a tweaked user interface and several apps designed for the large display including email and calendar apps.