Hi friends I am telling you About some worst problems in celkon campus A 402 in this mobile u have phased the problem when I am making a call to my stranger automatically it strucks means hangs automatically while using internet the mobile gets very very slow for few few minutes not seconds we have to switch off the mobile once very bad mobile.sometimes the speaker will not work in a proper way the charger slot also will not work in this mobile Friends please dont prepare celkon mobile THANKING YOU(PUVALLA KISHORE)