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I have 2 3G usb modems. 1 is ZTE and the other one is Huawei, both use a same ISP at same place. But the problem is that Huawei's device gets 3 signals while ZTE's device seldom get a single signal. Someone told me there's a chip inside the usb modems which become weaker after a year or so, and the reception gets weaker. I want to know the reason and the possible solution.

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One is better than the other. It really is that simple. – David Schwartz Oct 26 '11 at 15:23
Newer devices often have multiple antennas inside using them for antenna diversity. This can significantly increase the signal quality. – Robert Oct 26 '11 at 17:43
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The only solution I have even known with such an issue is to either make a warranty claim (depends on whether its still within it) or sadly put up with it. Then again, technology standards have come a long way in the past few years, so this may not necessarly be the case with some newer, more expensive brands.

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