There are many certification courses available for mobile application developers. Some of them are mentioned here.

• BlackBerry Certified Application Developer
• Oracle Certified Professional (OCP): Java ME Mobile Application Developer
• Sun Certified Mobile Application Developer (SCMAD)
• ATC- Android Certified Application Developer
• IBM Certified Mobile Application Developer – Worklight V6.0
• SAP Certified Development Associate – SAP Sybase Unwired Platform 2.1
• Mobile Application Developer Mobile Development Institute Certified Developer (MDICD)
• GIAC Mobile Device Security Analyst (GMOB)
• Microsoft's MTA: Mobile Development Fundamentals

I hope this will hep you.