With the activation of a new 2-year contract at T-Mobile, purchase one of six select 4G smartphones and receive a second 4G smartphone for $0 via this mail-in rebate. That's a savings of at least $130 and the first such offer we've ever seen from T-Mobile. Sales tax is added where applicable. Qualifying devices include the Samsung Galaxy S II, HTC One, Nokia Lumia 710, and more. Deal ends May 28.

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T-Mobile offers the Samsung Dart 3G Prepaid Android Smartphone for T-Mobile with a $50 Prepaid Refill Card for $99.99 with free shipping. (It's the first offer on the page.) Assuming you use the refill card, that's the lowest total price we could find by $78. Sales tax is added where applicable. Features include a 3.14" touchscreen, 3-megapixel camera, 802.11n wireless, Bluetooth, microSD card (2GB card pre-installed), Android 2.2 (Froyo) OS, and more.

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T-Mobile offers its T-Mobile SIM Card Activation Kit for $2.99 with free shipping. That's the lowest total price we could find by $2 and the lowest total price we've seen since August, when it was offered for free. This SIM card lets you use compatible phones on the T-Mobile network. It includes 10 minutes of airtime.

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At T-Mobile, search for "Sparq" to find the Alcatel Sparq Prepaid Cell Phone for T-Mobile for $29.99. With free shipping, that's the lowest total price we could find by $19. Sales tax is added where applicable. It features a 240x320 2.2" LCD color display, 8MB RAM, 32MB internal memory, slide-out text keyboard, FM radio, memory card slot, stereo Bluetooth, camera, and more.

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T-Mobile offers the Samsung T359 Smiley Phone for $50. (It's fourth from the top, be sure to select "none" from the drop-down menu of refill card amounts to see this price.) With free shipping, that's $25 off and the lowest total price we could find for this phone by $53. Sales tax is added where applicable. Features include a 1.3-megapixel camera, video recording, GPS, 3G connectivity, microSD card slot, up to 6.1 hours of talk time, and more.

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With activation of a new 2-year contract, T-Mobile offers the LG G2x Smartphone with Google Android for T-Mobile for free with free shipping. (Search for "T-Mobile G2x" to find it.) That matches our mention from two weeks ago as the lowest total price we've seen for this phone. (It's also a current price low by $150.) This 5-oz. phone features an NVIDIA Tegra 2 1GHz AP20H dual-core processor, 4" 400x800 touchscreen display, 8-megapixel rear-facing camera, 1.3-megapixel front-facing camera, 1080p HD video recording, Wi-Fi, 8GB internal memory, microSD slot, microUSB connectivity, and Google Android 2.3 (Gingerbread) OS. Note that a $35 activation fee applies.

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T-Mobile offers the LG Optimus T Prepaid Android Smartphone in Black (pictured) for $99.99. (Scroll down to find this phone.) With free shipping, that's $20 under our mention from two weeks ago, although that also included a $50 gift card (since expired), and the lowest total price we could find now. Sales tax is added where applicable. Features include a 3.2" touchscreen display, 3.2-megapixel camera, Android 2.2 OS, video recording, GPS, wireless and 3G connectivity, microSD card slot, Bluetooth connectivity, up to 6.5 hours of talk time, and more. Of note, also available is the Blackberry Curve 8520 Prepaid Smartphone for $137.49. (Find this phone on the second page.) That's $50 under our mention from two weeks ago (which also included a $50 gift card), and the lowest total price we could find now. The 8520 is a quad-band phone featuring a 320x240 LCD display, QWERTY keyboard, built-in Bluetooth, 256MB internal memory, microSD slot, 2-megapixel camera, media player, 802.11g wireless, and more.

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T-Mobile offers the refurbished LG Optimus T Prepaid Android Smartphone for T-Mobile in Titanium bundled with a $30 prepaid refill card for $119.99. (Search for "LG Optimus T" to find it.) With free shipping, that's $185 under the lowest total price we could find for a new model of the phone alone. Features include a 3.2" touchscreen display, 3.2-megapixel camera, Android 2.2 OS, video recording, GPS, wireless and 3G connectivity, microSD card slot, Bluetooth connectivity, up to 6.5 hours of talk time, and more. A 90-day warranty applies, although it's unclear who supports it.

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T-Mobile (now part of AT&T) again offers a $30 refill card for free with the purchase of select prepaid phones, as listed below. Each is among the best refill bundles we've seen from T-Mobile in recent months. The available phones, all with free shipping: refurbished LG dLite Prepaid Flip Cell Phone in Blue or Pink for $49.99 (search for "dLite") Samsung t249 Prepaid Slider Cell Phone for $49.99 (search for "t249 prepaid") refurb T-Mobile Rocket 2.0 4G Laptop Adapter for $59.99 (search for "rocket prepaid") Samsung t369 Prepaid Cell Phone for $59.99 (search for "t369 prepaid") Samsung Comeback Prepaid Cell Phone for $69.99 (search for "comeback prepaid") Nokia X2 Prepaid Cell Phone (pictured) for $79.99 (search "X2 prepaid") refurb Samsung Gravity T Prepaid 3G Touchscreen Smartphone for $79.99 (search for "Gravity prepaid") Nokia 5230 Nuron Prepaid Touchscreen Smartphone for $79.99 (search for "Nokia 5230 prepaid" refurb LG Optimus T Prepaid Android Smartphone for $119.99 (search for "LG Optimus T")

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T-Mobile offers the Nokia 5230 Nuron 3G Prepaid Cell Phone for T-Mobile in White, model no. 002P2W7, with a $30 Prepaid Refill Card for $79.99. (Search for "Nuron prepaid" to see this offer.) With free shipping, that's $20 under last month's mention (which included a $50 refill card) and it's $50 less than the lowest total price we could find for a prepaid unit. This phone features a 3.2" 360x640 touchscreen LCD, 2-megapixel camera / camcorder, microSD card slot (4GB microSD card included), Ovi Maps with navigation, stereo Bluetooth, microUSB connectivity, and more.

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T-Mobile offers its T-Mobile Comet Prepaid Android Smartphone bundled with a $25 Prepaid Refill Card for $119.99 with free shipping. (Search for "comet" to find it.) Assuming you use the credit, that's $41 under our December mention and the lowest total price we've seen. (It's also a current price low by $55.) This quad-band GSM phone features a 2.8" touchscreen, 3.2-megapixel camera with camcorder, Google Maps navigation, digital media player, microSD card slot, USB interface, Bluetooth, tethering and WiFi hotspot capabilities (additional charges may apply), Android 2.2 OS, and more.

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FREE myTouch 4G (Black). Offer valid 5/22/12-5/24/12. New 2-yr. agmt. req d. Restrictions apply. 

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FREE HTC Radar 4G or Samsung Galaxy S Blaze 4G. Offer valid from 6 P.M. on 5/9/12 to 11:59 PM on 5/9/12 only! New 2-yr. agmt. req d. Restrictions apply. 

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FREE Samsung Galaxy S Blaze 4G after $100 mail-in-rebate. Offer valid 5/4/12-5/6/12! New 2-yr. agmt. req d. Restrictions apply. 

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FREE $50 refill card with purchase of Nokia Lumia, Samsung Exhibit II 4G, T-Mobile myTouch Q, or T-Mobile Sidekick 4G. Offer valid 4/30/12 - 5/3/12 

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