User Agent

Mozilla/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 525) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537 UCBrowser/4.2.1.541 Mobile

This user agent belongs to UC Browser. UCWeb Inc. developed this Browser. This Browser run on WinPhone8.1 and it renders web contents with Trident on general Mobile Phone.

Browser - UC Browser

UC Browser

Version4.2 @ 32 bit
DeveloperUCWeb Inc.
ParentUC Browser 4.2 for WinPhone
Device TypeMobile Phone

Act as 

Crawler No
Fake No
Anonymized No

Device - Nokia

BrandNokia
ModelLumia 525
Platform windows 8.1 (32 bit) by Microsoft Corporation
Mobile Yes
Tablet No

Capabilities

Rendering EngineTrident by Microsoft Corporation (For Internet Explorer since version 4.0 and embedded WebBrowser controls (such as Internet Explorer shells, Maxthon and some media players).)
Pointingtouchscreen
Javascript Yes
CSS Yes Version: 3
Cookies Yes
Tables Yes
Frames Yes
IFrames Yes
Background Sounds Yes
Java Applets Yes
VB Script Yes
Activex Yes