Large firms issue Blackberry rampantly for senior-level employees and HR, hence it might rank highest in terms of usage. However, smaller firms might depend on Android phones to manage costs and scale.
Specific usage of application and platforms such Sharepoint or xobni would remain limited sectors.
I attended a presentation by Mango Springs and found it effective in terms of inhouse social platform, not sure if they offer and mobile application for that.
21st October 2011 From India, Mumbai