We do iPhone 4, iPhone 3GS, and the Nexus One of the signal comparison test. The results show (the lower the signal data in the table the better)), in most cases, iPhone 3GS the best signal, but with protection cover at the time, iPhone 4 signals to be slightly stronger in the Nexus One, even in Poor signal conditions, iPhone 3GS found almost no signal when, iPhone 4 played a role in the metal frame, making it the normal call. So, iPhone 4 signal problems do exist, but not serious.
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