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This is an accepted version of this page This is the latest accepted revision, reviewed on 15 January 2025. 2010 smartphone by Apple "iPhone 4G" redirects here. For the first iPhone with 4G networking, see iPhone 5. Not to be confused with iPhone 4s. iPhone 4 iPhone 4 (GSM model) in black Developer Apple Inc. Manufacturers Foxconn (UMTS/GSM model) Pegatron (CDMA model) Type Smartphone ...
It's the ultimate of ironies that Apple's externalized antenna array in the iPhone 4 -- hoped (and hyped up) to finally give us a phone every bit as good the rest of the device -- has become the ...
The iPhone 4s has a stainless steel, dual cellular antenna design, identical to iPhone 4 CDMA. Apple redesigned the antenna in the iPhone 4 CDMA after some original iPhone 4 users reported cellular signal attenuation problems as a result of holding it in certain positions.
Code-division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel.
Apple (AAPL) CEO Steve Jobs received a heads-up warning about potential iPhone 4 reception problems early in the planning process from the company's senior antenna expert, according to a Bloomberg ...
In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM.
The CDMA network has since been replaced by an 850 MHz UMTS network, Next G. U.S. Virgin Islands: 1986 [27] Israel: 1986 [27] Pelephone – began offering nationwide AMPS service in Israel in 1986. In the mid-1990s it converted to CDMA (IS-95 and later EV-DO) and in the mid-2000s converted to UMTS. Bolivia: 1991-1992 [34] Cayman Islands: 1987 [27]
As a more recent example the Apple iPhone 5 and iPhone 4S support quad-band GSM at 850/900/1800/1900 MHz, quad-band UMTS/HSDPA/HSUPA at 850/900/1900/2100 MHz, and dual-band CDMA EV-DO Rev. An at 800/1900 MHz, for a total of 'six' different frequencies (though at most four in a single mode).
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