Describe your AT&T Blackberry

Caller ID blocking feature may be on go to Settings and then tap on Call on a android phone
From there, tap on Additional Settings and in there, tap on Caller ID
just set the Caller ID to show Number" and it will be unblocked

There is no option on this phone to restrict the caller ID.

If the number is XXXXXX up as 'Restricted' then it can only happen if you dial *67 at the beginning of the number you want to call to block you caller ID information. Or, you can also call Verizon and have caller ID blocked for every number.

If this is happening for every number, then you will need to call Verizon and have them deactivate the caller ID restriction.

Yes, press the feature button and then enter 889. This will restrict the NBX system from sending out your Caller ID information for all calls. You will have to disable this by doing the same thing if you want to get your outbound caller ID back. Feature 890 will restrict the NBX system from sending out your Caller ID information for this call only.

i found the answer at http://support.sprint.com/support/article/Block_your_Caller_ID_on_your_outgoing_calls/case-wh164052-20100907-100732?&INTNAV=SU:SP:HDIB

Last Updated: Sep 08, 2010You can block your Caller ID information (name and phone number) on a call-by-call basis. Just dial *67 before dialing the number you're calling, and your information will not show up on their Caller ID display.you can also go to http://support.sprint.com/support/article/Know_the_difference_between_restrict_and_block_on_Caller_ID/case-wh164052-20100907-101149?&INTNAV=SU:SP:HDILast Updated: Sep 08, 2010Restrict Caller ID is a restriction that is placed on your account to completely block your information (name and phone number) from being displayed on any call you make. This has to be done by contacting our Customer Care team.Block Caller ID is something you can do yourself directly on your phone by dialing *67 before the number you're calling. This only affects one call at a time, so you have to dial the code before every call you want to block your Caller ID.**************i did some research and found the answer, please provide me with FAIR feed back i.e. 3 or 4 thumbs up. according to sprints website and also htc support forum there is no way to block the caller id automatically. dont kill the messanger i just wanted to pass the info found on htc and through sprint.

It's 'cuz they have their caller ID as private...

Hi,probably the person who is calling you has activated CLIR (call line identification restriction) or you don't have CLIP (call line identification presentation).

maybe check on the ringer type for restricted numbers- you can change ringers by all calls, restricted calls, and caller id numbers. your incoming restricted numbers is probably set at none or silent

I called RCA (Thompson)

There are a few services that make it easy to find the real number of a blocked or restricted caller. They do cost money (some as low as $5.00 per month to unmask numbers) to use with your cellphone.
You can even get the name and address of a blocked caller. Check into caller id unblocking services. Hopefully that will help you out.
Unblock restricted numbers with Trapcall's Bug Trap