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Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

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261–270 of 332 posts

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#261
post #166

A few years ago my parents were getting a lot of spam calls on their landline. Basically all of them were automated calls, either a recorded message or you were connected to a person shortly after the call was connected. I bought an OBi100 [0], which is a small device designed to be a VOIP adapter, but you can setup rules on how calls (incoming or outgoing) are handled. I setup a rule that if the call was from a with…

Truecaller is a spam blocking service that may help

https://www.truecaller.com/

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#262
post #242

Earlier quoted context omitted.

Exactly. With phone number spoofing, all the scammer needs is the phone number of someone on your list. With social media how long do you think it would take to generate such a list, and to get propagated to every scammer?

Can you explain phone number spoofing to me? Is there truly phone spoofing that is more than faking the dialer on the client?

You should read the book "Ghost in the Wires" by Kevin Mitnick. It will really open your eyes as to what is possible with phones.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#263

Tangentially; T-Mobile tags suspect numbers with "Scam Likely" caller ID. Opt-in to block these calls by dialing #662# - https://www.t-mobile.com/resources/call-protection edit; T-Mobile accepts forwarded text message SPAM at 7726 - https://www.t-mobile.com/responsibility/privacy/fraud-spam/s...

I use this, and it lets many scam calls through / unmarked.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#264
post #166

A few years ago my parents were getting a lot of spam calls on their landline. Basically all of them were automated calls, either a recorded message or you were connected to a person shortly after the call was connected. I bought an OBi100 [0], which is a small device designed to be a VOIP adapter, but you can setup rules on how calls (incoming or outgoing) are handled. I setup a rule that if the call was from a with…

This is the kind of solution that only works because basically nobody is doing it. If a big provider deployed it, it would take five seconds for it to be defeated.

While I agree, if you randomize the number that needs to be pressed to get by the prompt it could become a serious roadblock for most autodialer systems.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#265

Earlier quoted context omitted.

This is the kind of solution that only works because basically nobody is doing it. If a big provider deployed it, it would take five seconds for it to be defeated.

This is hacker news so this kind of solution is cool. And whatever the big guys are doing this user can always change his approach to defeat the spammers. Not globally but just for himself.

Yeah. This is so much like greylisting for email, but simpler. Greylisting has been around since at least 2007 and most spammers still don't bother getting around it.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#266
post #116

Tangentially; T-Mobile tags suspect numbers with "Scam Likely" caller ID. Opt-in to block these calls by dialing #662# - https://www.t-mobile.com/resources/call-protection edit; T-Mobile accepts forwarded text message SPAM at 7726 - https://www.t-mobile.com/responsibility/privacy/fraud-spam/s...

Half of my spam calls these days are from numbers that are supposedly in the same area code as my phone (likely spoofed as I've called a couple back before and the person didn't know what I was talking about when I said they called me) but since I no longer live in that area code I am able to use that as an identifier.

It's the same for me. Any time I see a call from my phone's area code, I know it's 99% likely to be spam (the other 1% is a recruiter, who I also don't want to talk to because they're trying to get me to take a job back in that same area code).

Having a phone with a far-away area code is actually really useful just for this reason, I've found.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#267
post #166

A few years ago my parents were getting a lot of spam calls on their landline. Basically all of them were automated calls, either a recorded message or you were connected to a person shortly after the call was connected. I bought an OBi100 [0], which is a small device designed to be a VOIP adapter, but you can setup rules on how calls (incoming or outgoing) are handled. I setup a rule that if the call was from a with…

I did something similar for myself nearly 20 years ago with Asterisk, and it was amazingly effective for my home phone. I'd whitelist numbers of friends and family, everyone else had to dial a number to get the phones in the house to ring.

I stopped doing it when I basically switched over to a cell phone as my only phone.

For a while 5 years ago I was getting a ton of spam calls, mostly the "Rachel from Credit Card Services" ones. One to two a day.

After trying the "Press 1 to be put on our do not call" and speaking to a person and asking to be put on their do not call, filing those FTC complaints, and still getting a few a day, I started using a "fake person generator" and just stringing them along. After a couple weeks of this I got one that went along with me for a few minutes and then said "Thank you for playing , you will continue to get calls." and hung up.

This was fantastic, because at the time I had 3 phone numbers associated with my cell phone, and I didn't know which one was getting the calls. I shortly after switched to Google Fi, and ditched the number that they had been calling, and the calls dropped way off.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#268
post #242

Earlier quoted context omitted.

Exactly. With phone number spoofing, all the scammer needs is the phone number of someone on your list. With social media how long do you think it would take to generate such a list, and to get propagated to every scammer?

Can you explain phone number spoofing to me? Is there truly phone spoofing that is more than faking the dialer on the client?

There is no way for you to verify whether the caller's phone number is actually the real source. Anyone can impersonate anyone. It's like the source address in an IP packet. You can put whatever you want in there.

This is mostly a US problem though. In Europe, the operators tend to be more strict on this, AFAIK.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#269
post #166

A few years ago my parents were getting a lot of spam calls on their landline. Basically all of them were automated calls, either a recorded message or you were connected to a person shortly after the call was connected. I bought an OBi100 [0], which is a small device designed to be a VOIP adapter, but you can setup rules on how calls (incoming or outgoing) are handled. I setup a rule that if the call was from a with…

Many landline handsets sold in the UK now have this as a feature.

What I've found is that whist it does stop a lot of spam calls they now fake local numbers. Worse they fake them with a missing digit. The phone companies could definitely spot that. I've wondered previously if international telecoms treaties stop the phone companies from acting to block these calls.

Re: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

#270

I just put my iphone on "do not disturb" full-time and use my favourites list to only allow calls though (from a selected list). People who double call are also allowed through. Then you are not constantly distracted by notifications, emails, texts, spam calls [1]. My thinking is, my phone should serve me, not the other way around, so I only check when I'm not focused on something else. Personally, I find useless not…

I love the DnD feature of Android but I've noticed that if someone persists they still get through. A feature I assume.

This is a setting. Go to settings and search for "repeat" and disable "Allow repeat callers".
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