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block a number

How do block an unwanted number?

iPhone 4S

Posted on Jun 2, 2012 1:49 PM

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26 replies

Dec 12, 2012 9:45 AM in response to franetic

People need to be aware of how apps like TrueCaller really work. They actually put your phone number and contacts into their database. When a call comes in to your phone, TrueCaller app will allow it if it is in your contacts, but if not, it opens a data connection (free if near a wifi node, but it will use your cellular data plan if no wifi) to see if it is in any of their lists to block.


So be aware, you are allowing the company access to your number and your contact information, and you may use cellular data in order for the app to work.


And also note, it does not truly block a call - every call connects, long enough for TrueCaller to check it against your contacts, or its lists if not found in your contacts. And if the call is coming from someone who has blocked their caller id, then it will ring through, as the app has no data to capture to use for lookup.

Dec 12, 2012 10:25 AM in response to dalman88

Thanks Michael. EVERYONE needs to understand that before an app can block a call, it has to come in first. Apparently how that is done is up to the app! Don't want some third party to have my contacts in their data base.


THE OBVIOUS SOLUTION IS TO HAVE THIS CAPABILITY INCLUDED IN YOUR FREAKIN' I-PHONE. Would be easy to do. But perhaps, that capability is NOT included so third parties can make a buck or not. And Apple can get a kickback or not. I dunno.


We should all demand this capability from Apple FOR all I-phones! It's just a software update!!! UUGGHHH!


dalman

Dec 13, 2012 4:57 AM in response to dalman88

dalman88 wrote:


Thanks Michael. EVERYONE needs to understand that before an app can block a call, it has to come in first. Apparently how that is done is up to the app! Don't want some third party to have my contacts in their data base.



dalman


Of course, this is why myself and others try to get people to realize that true call blocking (where the call NEVER connects to your handset at all) can only be done by the carrier at their actual switches. If that service is an option from your carrier, that would always, to my mind, be a preferable solution to any blacklisting type app (which must allow the call to connect at least long enough to capture the caller ID information).


If you would like to see blacklisting added to iOS, then submit your feedback to apple:


http://www.apple.com/feedback/

Dec 13, 2012 5:03 AM in response to dalman88

I agree here, it's only software. I saw a demonstration online with a jail broken iPhone that had a copy of iblacklist from cydia store and with this you could block unwanted calls and texts at will. Why is it such a problem for apple to sanction this to be sold in the App Store? I would gladly pay for it unlike the fakes that are in the App Store claiming to do this and are a complete waste of money. Forgive me for swearing please but the galaxy S3 has this function so what has been posted earlier about only the carrier can truly block a number is wrong.

Dec 13, 2012 5:25 AM in response to t4gey

No, blacklisting is not literally the same as call blocking. The Galaxy and othes use blacklisting - an app (3rd party or part of the OS) has to allow the call to connect so it can use the caller ID to check the number against its allowed or disallowed list. While it may mute the call during the list lookup, and then drip the call if it is in the block list, the call does have to go through to your handset for it to work. A caller who blocks their caller ID defeats blacklisting software as it never gets the caller ID to use to lookup against its lists.


With true call blocking, your service provider intercepts the number at their swithes, and it is never allowed to go through to your handset. Even a caller who blocks their caller ID will not go through, as the carrier's routing software always has access to the caller ID information, regardless of whether the caller blocked it or not.


No handset can execute a true call block - all they can do is use the caller ID to drop a call once it has connected.


P.S. for those who've never tried it, this is one advantage of google voice - GV has a spam filter where you can add callers you wish blocked. For those, the Google Voice system identifies them when they try to call, and simple hangs up on them instead of ringing the call through to your handset. That also means they are blocked on any and all numbers you forward your GV number too, not just one particular handset. Personally, I wish the cell service providers would just enable an analogous feature on your account web page - they could do so if they wished.

block a number

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