There should not be a fee when transfering from one phone to another as long as they have the same operating system.
For more information about transfering applications, I would take a look at this article below. It should contain all needed information about this subject:
- Did you replace your handheld or get a new one? Want to know if you can transfer/share your SlingPlayer app?
Hope this clear things up!
Sling Media Moderation Team
Do you happen to have a different Google Play account now? The reason I ask is because Android will allow you to install their applications on unlimited Android devices so as long as you were logged into the same Google Play account that you originally purchased the SlingPlayer app under you should not have to pay for the app again.
The Sling Moderation Team - Leanne