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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Robᵉʳᵗ Graham 😷‏ @ErrataRob 8 Jan 2019
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      Robᵉʳᵗ Graham 😷 Retweeted matt blaze

      1/ Well, to answer this, sign up for the phone company's family plans designed to allow you to track your children. It's hit or miss, sometimes very accurate, sometimes not.https://twitter.com/mattblaze/status/1082881452079902721 …

      Robᵉʳᵗ Graham 😷 added,

      matt blazeVerified account @mattblaze
      Motherboard had a great piece today about telcos selling your location data. https://motherboard.vice.com/en_us/article/nepxbz/i-gave-a-bounty-hunter-300-dollars-located-phone-microbilt-zumigo-tmobile … But why does your carrier know your location? How precise is it? My congressional testimony (from 2012, but still reasonably current), talks about this. https://www.mattblaze.org/papers/blaze-gps-20120517.pdf …
      Show this thread
      1 reply 7 retweets 8 likes
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    2. Robᵉʳᵗ Graham 😷‏ @ErrataRob 8 Jan 2019
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      2/ Modern phones and towers have multiple abilities to track your location. For one thing, because of speed-of-light delay, the tower must know your distance from the tower to within 100 meters.

      1 reply 0 retweets 3 likes
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    3. Robᵉʳᵗ Graham 😷‏ @ErrataRob 8 Jan 2019
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      3/ Next, towers know which directional antenna your signal arrives on. This gives them a 120° arc within which to locate you, the closer you are to the tower, the more accurate that is, of course.

      1 reply 0 retweets 3 likes
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    4. Robᵉʳᵗ Graham 😷‏ @ErrataRob 8 Jan 2019
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      4/ Modern 4G/LTE has additional crap like phased array, multi-user MIMO, and stuff which allows the tower to get even closer. You need a modern phone for that, so they can locate a iPhone Xs better than an iPhone 5.

      1 reply 0 retweets 3 likes
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    5. Robᵉʳᵗ Graham 😷‏ @ErrataRob 8 Jan 2019
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      5/ In Modern 4G/LTE, they can also ask your phone. Phones scale their power output to reach only the nearest tower, so multiple towers can't triangulate/multilaterate your phone. But your phone can hear towers, so the phone can triangulate/multilaterate itself.

      1 reply 0 retweets 6 likes
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    6. Robᵉʳᵗ Graham 😷‏ @ErrataRob 8 Jan 2019
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      6/ So, part of the 4G/LTE protocol consists of the tower being able to ask the phone it's location. However, it typically doesn't do this all the time, only in such cases like when you place a 911 emergency call, and they need to know your location.

      1 reply 1 retweet 4 likes
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    7. Robᵉʳᵗ Graham 😷‏ @ErrataRob 8 Jan 2019
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      7/ According to the E911 regulations, mobile phone companies are supposed to be able to guarantee that most emergency 911 calls can locate you within 50 meters, or less. So it's the government driving this.

      2 replies 1 retweet 3 likes
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      Colm MacCárthaigh‏ @colmmacc 8 Jan 2019
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      Replying to @ErrataRob

      Some mobile providers also sell or bundle federated wifi access from separate networks of thousands of locations. Can locate you to the nearest Starbucks.

      11:35 PM - 8 Jan 2019
      0 replies 0 retweets 0 likes

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