The Samsung SGH-T639 is a clamshell

mobile phone A mobile phone, cellular phone, cell phone, cellphone, handphone, hand phone or pocket phone, sometimes shortened to simply mobile, cell, or just phone, is a portable telephone that can make and receive calls over a radio frequency link whil ...

manufactured by

Samsung Electronics Samsung Electronics Co., Ltd. (, sometimes shortened to SEC and stylized as SΛMSUNG) is a South Korean multinational corporation, multinational electronics corporation headquartered in Yeongtong-gu, Suwon, South Korea. It is the pinnacle of ...

and offered by

T-Mobile T-Mobile is the brand name used by some of the mobile communications subsidiaries of the German telecommunications company Deutsche Telekom AG in the Czech Republic (T-Mobile Czech Republic), Poland (T-Mobile Polska), the United States (T-Mobile ...

. It has four external changeable faceplates, each with a different color. All four colors (blue, red, olive, and navy) come with each phone. The external screen is longer and slenderer than many similar phones, measuring length by width. Users can choose the color of the text displayed on the external screen immediately after the phone is closed. The larger internal screen, which is found by opening the phone in portrait mode, measures width. The SGH-T639 has a 1.3

megapixel In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a raster image, or the smallest point in an all points addressable display device. In most digital display devices, pixels are the smal ...

camera/camcorder with a small rectangular self-portrait mirror. It has 30

megabytes The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB. The unit prefix ''mega'' is a multiplier of (106) in the International System of Units (SI). Therefore, one megabyte is one million bytes o ...

(MB) of phone storage and a

microSD Secure Digital, officially abbreviated as SD, is a proprietary non-volatile flash memory card format developed by the SD Association (SDA) for use in portable devices. The standard was introduced in August 1999 by joint efforts between SanDis ...

memory card slot. It operates on

, a

GSM The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such as ...

network, and has a

SIM card file:SIM-Karte von Telefónica O2 Europe - Standard und Micro.jpg, A typical SIM card (mini-SIM with micro-SIM cutout) file:Sim card.png, A smart card taken from a Global System for Mobile Communications, GSM mobile phone file:Simkarte NFC SecureE ...

, which can be found by removing the battery case. It has a numerical keypad and an OK button surrounded by four navigational arrow keys (which double by leading to call records, voice notes recording,

contact list A contact list is a collection of User (computing), screen names. It is a commonplace feature of Instant Messaging and Presence Service, instant messaging, Email clients, online games and mobile phones. It has various trademarked and proprietar ...

, and new

text message Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile devices, desktops/ laptops, or another type of compatible comput ...

respectively), and two

soft keys A soft key is a button flexibly programmable to invoke any of a number of functions rather than being associated with a single fixed function or a fixed set of functions. A softkey often takes the form of a screen-labeled function key located al ...

, along with T-Zones (T-Mobile's

web browser A web browser is application software for accessing websites. When a user requests a web page from a particular website, the browser retrieves its files from a web server and then displays the page on the user's screen. Browsers are used on ...

), call, end/power, clear, and shortcut keys. The customizable shortcut key with the square icon can lead to or open any feature, application, or menu on the phone. On the left side the phone has two up/down volume rocker keys and the combination charger/headphone jack, and on the right has a key that accesses camera mode as well as the

memory card slot.

References

Samsung mobile phones Mobile phones introduced in 2007 {{Samsung-mobile-stub