According to [these phone specs from Microsoft](http://www.microsoft.com/en-nz/mobile/phone/7230/specifications/), the browser is Opera Mini. [Opera Mini is not supported on Stack Exchange](http://meta.stackexchange.com/a/140201/262755). ([see also](http://meta.stackexchange.com/questions/102010/functionality-regression-on-opera-mini/102103#102103) and [also](http://meta.stackexchange.com/a/177509/262755))