For the Samsung contacts, you can sync the contacts to Kies.
To recover lost contacts from Android internal memory, the only way is to use Android contacts recovery tools.
If it says unlimited, you have 1.5G and then it will throttle.
FWIW, it will say unlimited tomorrow :)
I'm Currently On THE Unlmtd Talk And Text 15 Gig +1 Bouns Gig Family Share Plan, I Just Read Over In the AT&T forum that there currently matching the sprint 20gig Data Plan For 100$ As Long As You...
Always appreciate these contests!