also since it is reflecting energy back to the phone when the phone is transmitting, it will overheat the phone's RF power amp. high gain antennas are usually very narrow band devices, and the SWR (standing wave ratio) can climb beyond 3:1 as you get outside the bandwidth of the antenna. high SWR means energy reflected back to the transmitter, where it is wasted as heat. marginal overheating may not damage the phone right away, but could over time, degrade the output transistors. or it may trigger protection circuits that cut back on the transmitted power. there are also large signal losses receiving (google "antenna reciprocity") on an antenna that isn't matched to the frequency in use. these are ways the phone isn't performing as well as it would with the proper antenna.
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