As of my last update in January 2022, several mobile marketing agencies were recognized for their expertise in mobile marketing strategies and services. However, it's important to note that the landscape of mobile marketing agencies is continually evolving, and new agencies may have emerged since then. To find the most up-to-date information and assess the best agency for your specific needs, you should conduct research and consider your objectives and budget. Here are some mobile marketing agencies that were notable as of 2022: 

• Fetch: Fetch is a mobile marketing agency known for its expertise in mobile app marketing, user acquisition, and app store optimization (ASO). 
• App Annie Ascend: App Annie Ascend offers data-driven mobile marketing services, helping clients make informed decisions about their mobile app strategies. 
• Moburst: Moburst is an award-winning mobile marketing agency specializing in mobile app marketing, user acquisition, and app growth strategies.