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How to block a number on Sprint?
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Block a Number on Sprint
1. Open https://www.sprint.com/en/login.html in a web browser and log in.
2. Click My Sprint.
3. Click Permissions.
4. Click Block Voice or Block Text.
5. Click the line you want to block a number on.
6. Click Block only the following phone numbers for inbound and outbound calls.
7. Type the number you want to block and click Add number.
8. Wait 15 minutes.
9. Turn your phone off and then back on again.