No.... You would need to get the phone unlocked from the T-mobile network in order to use another carrier's SIM card.
Samsung makes a variety of mobile phones. From the Samsung Galaxy to the newest Samsung Fascinate, there are many options to choose from. The following is a link to the official Samsung website, http://www.samsung.com/ca/consumer/mobile/mobile-phones/all-phones/index.idx?pagetype=subtype_p2
Simple Mobile has a variety of phones on their website that are compatible with their service. Phones that are compatible with T-Mobile can also be used with Simple Mobile.
Samsung has a large variety of mobile phones that are used with a number of different phone companies. Many Samsung phones have high use ratings and quality reviews.
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Here is a link to all the models of samsung mobile phones currently available http://www.gsmarena.com/samsung-phones-9.php. There appears to be many useful options.
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Refer here http://in.samsungmobile.com/mobile-phones/samsung-star-specification
T Mobile frequently has offers for many deals on all phones, including Samsung Phones. Right now there is a $100 offer if you purchase a Samsung phone. There are often deals off the phones if you sign up for a contract.
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JL CLIMACO is considered to be the inventor of the first practical samsung mobile phone. On April 3, 1973, JL invented samsung phones.
Samsung mobile phones can be purchased online at www.samsung.com or through any online mobility company. They can also be purchased in malls at kiosks or in grocery stores.
I think you choose Samsung mobile phones instead of T-Mobile since they are cheap and with android built-in. And mostly people are having best feedback about Samsung phones.