I've long wondered back & forth if I should take up an aluminum battery cover, as is being sued in many recessions over the poor reception. But due to the low price of 9 and the fact that the plastic back (n) simply feel ever so cheap, I risked it once. Fortunately! I can not notice any loss in Mobile. Only the wifi is minimal weaker, but I did not think so tragic, because I have good reception in my apartment anyway. (I surf the net from O2) The battery cover itself is perfectly finished and evaluates the mobile massively.