Mobile carrier detection without IP address

Question

Is it possible to read a mobile device's carrier info with JSP or any other server side language? Detecting mobile carrier with IP address is not an option since I want to target users that use wi-fi as well.

Answer 1

It´s not possible. Maybe it could exist some special operator API, although I don´t know for WIFI users.

For GSM connection you could use IPs or look at HTTP headers. Sometimes operators inject particular values.