It sounds like the person you are calling may be blocking restricted calls, so you can not call them anonymously.
To turn off caller ID, open Settings, tap Applications, and then tap Phone. Locate and tap More Settings. Tap Caller ID. And select Hide Number.
Use *67 to hide your phone number
The free process hides your number, which will show up on the other end as “Private” or “Blocked” when reading on caller ID. You will have to dial *67 each time you want your number blocked. Like what you're reading?
It sounds like the person you are calling may be blocking restricted calls, so you can not call them anonymously. If you must call the person, try calling them without using *67 so that your number shows up on their Caller-ID.
*67 does not work when you call toll-free numbers or emergency numbers. While using *67 works on smartphones, it must be entered each time you dial a number. Most cellular carriers offer a way to block your number on all outgoing calls using the Android or iOS device settings.
They can hide their number by dialing *67 before your phone number and the call will come in as No Caller ID. If the blocked caller gets through from a different number or by hiding their number, then they'll probably be pretty certain you have blocked them.
You can uncover an unknown caller ID by using the *69 feature code, third-party apps, or contacting your phone service provider. Unknown callers could be hiding their identity to try to scam you, so it's important to unmask them before you fall victim.
To block caller ID for an individual call, dial 1831 (or #31# from a mobile) then the number you are calling. Generally, this will make sure the person you are calling will not see your number.
*31# (Disable Caller ID)
If you want to keep your privacy and prevent others from knowing when you call them, you can disable caller ID by using this code.
This Vertical Service Code, *82, enables calling line identification regardless of subscriber preference, dialed to unblock withheld numbers (private callers) in the U.S. on a per-call basis.
Blocked phone calls go straight to voicemail
When someone you've blocked calls you, they'll be sent right to your voicemail, as if your phone was turned off. This is their only clue that you blocked them. The blocked caller can still leave a voicemail, but it won't show up with your regular messages.
Caller ID Blocking blocks your number from being displayed through Caller ID. So, when you are blocked by someone, you just need to hide your caller ID, and the person will not know you.
Blocking a number via the Phone app, Contacts, or Settings will only affect regular calls and messages on Android. The blocked number can still contact you on other apps like WhatsApp, Facebook Messenger, Snapchat, Instagram, etc. You need to block the person separately on these apps.
Unhide a Phone Number
If you have caller ID blocked by default, you can turn it back on for a particular call by dialing a code. Generally, you can dial *82 before a call to re-enable caller ID and dial *65 to turn off caller ID blocking until further notice.
In case, the number is still not visible to everyone, there are chances that you might have opted either for a caller ID restriction plan or a withheld number plan. Contact your network service provider to cancel that plan.
*67 - Block phone number on Caller ID systems. *69 - Redial the last number that called you. *70 - Places your call on hold so you can answer another. *72 - Forward your call to another phone number.
*67 has nothing to do with whether you've blocked the number or not, it just tells your carrier to not send your callerID. It works with any number. If someone blocks your cell number, can you put *67 before it and text or call them? No - that won't work.
This is because you can only call back a private number if you pick up the phone before someone else calls you. If you are called between the time you receive a call from a private number and the time you use the return code, you won't be able to call back the private number.
Reasons Why Android Stops Making (or Receiving) Calls
You might be in a dead zone, airplane mode could be turned on, your bill might not be paid up, malware could be wreaking havoc on your phone, or a software issue could be at play.