Any good companies that help with mobile optimization

Since we’re on the topic of mobility anybody here know of any good companies that help with going mobile. My friend mentioned DSI Global so I was going to check them out but I like to have options. I’ll take all the help I can get. Thanks in advance guys.

My company is trying to get a modern technology update which is going to include mobile optimization. I’m not here to advertise the company so will refrain from mentioning the name but need some suggestions on companies we can choose from to use. Anyone?