I have a Samsung galaxy j5

i have a samsung keystone 2 i blocked 2 numbers by mistake how can i unblock dem

Hi cassie. Are you pertaining to Samsung E1200?

If yes, try this: (A complete guide on how to block/unblock a number)
1. From the home screen, press Menu.
2. Scroll to Settings, then press Select.
3. Scroll to Applications, then press Select.
4. Scroll to Call, then press Select.
5. Scroll to All calls, then press Select.
6. Scroll to Auto reject, then press Select.
7. Press Options.
8. Scroll to Create, then press Select.
9. Press OK.
10. Scroll to the required option (e.g. Contact list), then press Select.
11. Scroll to the required number, then press OK.
12. Press Options.
13. Scroll to Save, then press Select.
14. The number has now been blocked. Click Next to continue.
15. To unblock a number scroll to the required number, then press OK.
16. Press Options.
17. Scroll to Save, then press Select.
18. The number has now been unblocked.

Source

Could you tel me how to unblock a number I blocked, my phone is a Samsung GTEZ 1200

GT E1150i but its OK I have fathomed it with - Settings- Call-All Calls- Auto reject - reject list. Thanks. This may be useful to someone else with a basic phone!

It depends on which Samsung phone you use. Please tell us which Samsung phone are you using so we can provide help to you. :)