Questo è il testo del Wiki su "iPhone 4" link
Connectivity:
GSM model: quad-band GSM/GPRS/EDGE(800, 850, 900, 1,800, 1,900 MHz)
Quad-band UMTS/HSDPA/HSUPA (800, 850, 900, 1,900, 2,100 MHz) (800 MHz is not yet officially supported by Apple)
molto confuso, se Apple non supporta 800 MHz, allora perché hanno inserito l'800 nella specifica?
Qualcuno può spiegare cosa significa questa specifica tecnica?
Se continui a leggere ...
In contrast to Steve Jobs' announcement at WWDC 2010, recent Federal Communications Commission documentation has shown that the iPhone 4 contains a penta-band 3G UMTS antenna, not a quad-band 3G UMTS radio, as advertised by Apple.
According to the FCC documentation filed by Apple, the radio inside the iPhone 4 supports 800, 850, 900, 1,900, and 2,100 MHz. The 800 MHz frequency, which is most commonly used in Japanese mobile phones, is not advertised as being supported by Apple.[51] However, the 800 MHz band is a subset of the 850 MHz band, which probably explains why the device is advertised as quad-band.[citation needed] The chip-sets were manufactured by Skyworks Solutions[52] and Infineon for GSM version.
Leggi altre domande sui tag iphone