what is difference between witheld and unknown caller number and how to block both

[andyxxl]

Dear Gents

I have problems with uknown callers. I activate blocking by procedure bellow

1. From the Home screen, tap the All apps button.
2. Tap Contacts.
3. Tap on the name of a specific contact.
4. Tap the Edit icon.
5. Tap Menu.
6. Tap to un-check All calls to voicemail

The problem is if I use some app blocking calls it does not work with withdrawn numbers. On other hand If I set this procedure above with caller ID suppressed by #31#my_called_numbet works but if there is witheld number phone is ringing. I have tried app called Mr. Number Block calls and spam but it does not work with witheld numbers.Only with those ones which are suppresed this control code above.

Many thanks for clarification what is withdrawn and unknown caller ID.

Best regards

Andy

[andyxxl]

Dear gents nobody has comment on that?

Can anybody explain what means witheld number in Sony Xperia call log? Is it caller who suppresed number propagation by control prefix hash-31-hash in front of dialed number? I have tried plethora call blocing app as Mr Number etc and if it is witheld number Mr Number just does not work and mobile is ringing no matter that such uknown or witheld number from call log is put to black list and app shall block it. Many thanks for clarification.

Best regards

Andy

[Uliwooly]

@andyxxl

you might want to contact your carrier network, as if it's a withheld number or unknown there's no way to block it, only your carrier network can do so.