Still struggling to find that perfect Valentine's Day present for your sweetheart? On Saturday Feb. 11, T-Mobile has a tempting offer for all you last-minute tech gift shoppers: The carrier's entire stable of 4G smart phones—and some tablet computers—will be offered with rebates that essentially eliminate the cost of the device. But is it a really good deal for shoppers?

For one day only, the carrier is offering up to $500 for new customers and current subscribers eligible for phone upgrades who choose a new T-Mobile 4G smart phone. And among the options are some of the top smart phones tested by Consumer Reports, including: the Samsung Galaxy S II, the HTC Amaze 4G, and the T-Mobile Sidekick 4G. (See Consumer Reports' latest Ratings of smart phones for the full list of recommend models for T-mobile service.)

Also available: The Samsung Galaxy Tab 10.1 and the T-Mobile SpringBoard, two of the recommended tablet computers in our latest Ratings online.

Of course, shoppers need to be aware of the usual caveats. The offer requires a new two-year T-Mobile contract, which start at $70 per month for 200MB of data. And customers will still have to first pay for the new mobile device and later recoup its cost via a mail-in rebate from T-Mobile.

But perhaps the most important consideration? Contract service from T-Mobile—or any other major U.S. phone service provider—isn't highly regarded among consumers. In our latest survey on wireless cell phone survey, our experts noted.

When it comes to standard cell-phone service (meaning billed monthly, often under a contract), the most satisfying carriers in our Ratings were smaller [providers].

And where did T-Mobile rank with consumers in our latest Ratings of cell phone service? Nearly last-place.

If you have a Consumer Reports subscription, you can check out the entire Jan. 2011 report, Best phones & service.

And check out our free online buying guide to cell phones to help you find the right smart phone for you or your significant other.

Previously:

• Report: T-Mobile to limit national data roaming for subscribers
• T-Mobile offers new pay-by-day phone plans as low as $1 per day
• T-Mobile to offer cheap, no-contract smartphone plan at Walmart

T-Mobile Is Giving Away Its Stock of 4G Smartphones This Saturday [Gizmodo]
T-Mobile Pushes Out Statement, Valentine’s Day Sale Website Now Live [TmoNews]
Valentine's Day Sale [T-Mobile website]