I have a better plan to unlock your motorolla A1000 and samsung. http://www.Ihav.net/. this site contains unlocking codes in all types of mobile. Use it.
unlocking a phone can be done by many ways but the best method and the safe way to unlock a phone is through codes. even in codes too there are many providers who offer you free services. bu can even try them.
Hi free unlocking service is not available for your motorola a1000 and samsung mobile. So better you can go for paid unlocking service. I would suggest this site SuperUnlockCodes.com here you can get the unlock code and unlock your mobile.