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3G-4G Spectrum - ResearchGate.pdf

Radio spectrum refers to a range of radio frequencies. The ... 3G-4G Spectrum ... 3G devices like the iPhone ...  

Unlocked iPhone FAQ, including AT&T plan info (updated).pdf

It's about frequency. The iPhone 4 supports the following frequencies ... 1800, 1900 MHz AT&T uses the 850 frequency for 3G ... the very best plan is H2O Wireless ...  

Although an AT&T iPhone can be unlocked or jail.pdf

Although an AT&T iPhone can be unlocked or jail-broken for use with T-Mobile USA since it too uses GSM (even though it uses different frequencies) unfortunately ...   Down

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