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An iPhone 4 A1332 with a micro-SIM card removed with a paper clip, showing its SIM card compartment. The GSM iPhone 4 uses a micro-SIM card, which is positioned in an ejectable tray, located on the right side of the device. The CDMA iPhone 4, however, the phone connects to the network using an ESN. All prior models have used regular mini-SIM ...
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 ...
It shouldn't be surprising that rival cell phone manufacturers weren't thrilled when Apple (AAPL) CEO Steve Jobs said the iPhone 4's antenna problems aren't specific to that device but rather are ...
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).
A base transceiver station (BTS) or a baseband unit [1] (BBU) is a piece of equipment that facilitates wireless communication between user equipment (UE) and a network. UEs are devices like mobile phones (handsets), WLL phones, computers with wireless Internet connectivity, or antennas mounted on buildings or telecommunication towers.
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 ...
Most 2G cellular systems, with the notable exception of IS-95, are based on TDMA. GSM, D-AMPS, PDC, iDEN, and PHS are examples of TDMA cellular systems.. In the GSM system, the synchronization of the mobile phones is achieved by sending timing advance commands from the base station which instruct the mobile phone to transmit earlier and by how much.