Horrible signal!

So I switched from my Xperia z3 back to a g2 and the signal is horrible!! My nexus 4 gets better signal! Is this a issue with the phone itself or current firmware . I'm currently running cm12 on the g2. I used to get lte almost everywhere with the Xperia and most places with the n4 but I can barely get H+ with the g2??

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