I currently use a Samsung Tab 3 from Sprint with 2gig of data per month for $15/month and the tab was $49. I use the TeamViewer
http://www.teamviewer.com/en/index.aspx app to gain access on the tablet, my phone, my assistant on his phone or any computer. We used to use LogMeIN but TeamViewer works much better. Went to this after we found out it would cost $7k + to replace our wideband Freedom repeater. I wish Rainbird would come up with a cheaper alternative for mobile access, especially since Toro offers their app for free. The only downfall is with the Freedom radios multiple people can be using them as long as you don't step on each other while only one person at a time can be logged in with the remote client.