WCF Doesnot work on iis7.5 server but working on development machine

See more:

WCF

VS2010

service

web-hosting

, +

I have created one WCF service ,which works fine on visual studio debug mode ,but when i hosted it on IIS 7.5, its even hosted properly i.e methods can be accessed on publicly,
Scenario: client(device) do call the method without service name,
ex: http://xxx.xxx.xxx.xx:port/?wsdl (client calls)

but service is hosted like this
http://xxx.xxx.xxx.xx:port/ServiceName.svc?wsdl

Now here i have problem
How to call service without service name ,even i searched in google there i am getting lot of links but m not getting the solution or weather something missing in service which development machine is taking care of itself.

Please suggest me

Thanks in advance