Phone - Samsung Galaxy S4
In Build 10 changelog the creative mode interaction range was increased to 12 blocks. Unfortunately, this was also increased in survival mode when split controls is off when I expect it should not have been increased in survival mode at all.
How I tested: in a brand new survival world in build 10 with split controls off, I stood against the side of a hill and I dug horizontally without moving until my player could not "reach" any more blocks. Then I counted how many he dug - it was 12. When I turn split controls on the interaction range returns to the expected 5 blocks.
This has been confirmed by several users in the G+ community.