In my case it's only a problem with the bars indicator of the signal ,the phone have a good reception . In the same spot a lg g2 have -105 dbm , a huawei p6 - 108 dbm ,and idol x - 98 , -100 dbm max , so it works ok . The problem is only with the vers 5.10 with this one i have very bad reception ,and moments with no network at all. With any other version the phone works ok in therms of gsm sensibility only the bars sistem of the signal is bugged .