As Apple built the IPhone, they took a different approach to constructing it than other phone manufacturers did: they made a phone with the same capabilities of the desktop computers and laptops we have used thus far, such as office and business, multimedia and gaming, networking and internet, and so forth. As always, Apple made the hardware and software by themselves, rather than having different companies making it. Apple incorporated their famous MultiTouch sensing technology, a technology that could sense complex finger gestures, into the outstanding scratch-resistant touchscreen into all IPhones, and 2 years later, they constructed the 3GS with a Fingerprint-resistant coat. Apple manufactured the Iphone with 3 sensors, one a proximity sensor to disable the display and touchscreen whenit is taken near the ear for a call, the second a light sensor to adjust the brightness of the screen for power conservation, and the third, a 3-axis accelerator to adjust the screen's orientation, portrait or landscape, according to the position of the device and depending on what application or program. Though the orignal IPhone was made of aluminum, the 3G and 3GS were made of a durable plastic to strengthen the GSM signal. Like the Ipod touch, Apple designed the Iphone to use a rechargeable battery like all phones, however, this one, unlike others, could only be repaced by the manufacturer. Like the Ipods, the the battery could recover 80% of its initial capcity. The OS, IPhone OS, was based on the core of Mac OS X and its software components, and consumed less than 500 MB of the IPhone's hard drive space. It used Itunes and was given full support for the 2 latest versions of Microsoft Windows, XP and Vista. Apple made the Iphone simple to use by giving the Iphone the capacity of running applications during a call or during music playing. The Iphones had support for common phone functions such as audio conferencing, caller ID, call holding, call merging, and integration, and had another feature called Voice Control, or making a call using one's voice. It also featured visual voicemail, a list of voicemail messages eliminating the necessity for "voicing", and ringtone creation and customization with ITunes. The IPhone took its music library layout from the IPods, which had different criteria to sort or alphabetize songs by, as well as the large typeface (font) for easy selection. Also, The Gapless Playback feature allowed the use of digital video to view widescreen TV shows and movies. The IPhone's support for Local Wireless networks AND GSM/EDGE networks allowed connection flexibility, that is, choice of connection. Even more flexibility came from its ability to automatically select the strongest or nearest Wireless Network. The IPhone's keyboard was an on screen virtual keyboard that helped with texting, email, web browsing etc. The text enlargement features and support for TTY devices helped to accomodate the vision-impaired as well as the hearing impaired. Hands down, no other phone will ever match the iPhone, and nobody else can make one.