I bought Samsung window phone this year in February.. It was working fine for 2 weeks but then my phones center button and power button stopped working.. It works sometime ... But it's not properly working ... I have been to Samsung service center for 4 times but they just update my phone while the problem is somewhere else.. I requested them to replace my cell. . But they r not paying attention to this case... Its only been 4 months I bought this phone ... N equally I have been to service center for this problem... Waiting for your reply....