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It's been nearly three weeks since the iPhone 4 went on sale. But it wasn't until yesterday that Consumer Reports, the ultimate authority in which big-ticket items to buy and which to bypass ...
Consumer Reports' stinging rebuke to Apple over the vaunted tech company's iPhone antenna problems ultimately may not deter too many Apple afficianados from buying, but it sure can't hurt Google's ...
Despite a growing controversy over the reception troubles plaguing the iPhone 4, Apple (AAPL) does not plan to recall the device, The Wall Street Journal reported late Thursday, citing a person ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 15 February 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 ...
An analogy to the problem of multiple access is a room (channel) in which people wish to talk to each other simultaneously. To avoid confusion, people could take turns speaking (time division), speak at different pitches (frequency division), or speak in different languages (code division).
Another problem may be a faulty transceiver inside the base station. Calls can also be dropped if a mobile phone at the other end of the call loses battery power and stops transmitting abruptly. Sunspots and solar flares are rarely blamed for causing interference leading to dropped calls, as it would take a major geomagnetic storm to cause such ...
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.