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Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner

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This is an article in Spanish, translated. I do not know if it applies 
worldwide.


<https://bandaancha.eu/articulos/android-detectara-llamadas-numero-falso-11792>

Android will detect calls with spoofed numbers by sending a real-time 
RCS message to the legitimate owner

By Joshua Llorach
Published 3 June 2026 10:50

Until last summer, it was very easy for malicious actors to spoof the 
number that appears on a mobile phone screen as the caller ID when a 
call rings. The lack of a system to validate numbers and their origin 
allowed spammers and other malicious actors to inject traffic into the 
network with a spoofed caller ID, a practice known as CLI spoofing.

Since June 2025, mobile operators have been filtering calls originating 
from abroad that use Spanish numbers without permission, as well as 
applying other validation checks to make this practice more difficult. 
Added to these measures is the system from Orange and Telefónica that 
displays a warning on the screen for suspicious calls.

Falsifying a number known to the victim makes the attack much more 
effective, especially in the age of AI, where it is very easy to imitate 
a person’s voice, so Google is joining this fight with its own measures 
against CLI spoofing.


The Android Phone app has started to verify the caller ID of incoming 
calls by connecting in real time to the supposed originating mobile 
phone to check that it is indeed the one making the call.

For this to work, both parties must be Android users with the Phone app. 
When the call rings on the recipient’s device, the phone sends an 
encrypted RCS message to the legitimate owner of the number to ask if 
they are actually making the call at that moment. In this way, the 
recipient’s phone can tell when the call is fake.

The idea is interesting, as it does not use OTT data traffic, but rather 
core network services, making the exchange of information faster and 
more reliable.

This feature is being rolled out first on Pixel devices running Android 
12 and above, but Google has released it as an open standard so that 
other phone apps and operating systems can use it, meaning that in the 
future it would be possible to verify numbers between Android and iOS if 
the parties involved wish to do so.

Translated with DeepL.com (free version)

-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-10 11:44 +0200
  Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Jörg Lorenz <hugybear@gmx.net> - 2026-06-10 17:59 +0200
  Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-10 14:29 -0500
    Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-10 23:19 +0200
    Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Theo <theom+news@chiark.greenend.org.uk> - 2026-06-11 22:32 +0100
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-11 20:18 -0500
        Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-12 12:16 +0200
          Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-12 15:13 -0500
            Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Andy Burns <usenet@andyburns.uk> - 2026-06-13 08:29 +0100
              Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-13 15:52 -0500
                Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Jörg Lorenz <hugybear@gmx.net> - 2026-06-14 07:35 +0200
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Jörg Lorenz <hugybear@gmx.net> - 2026-06-12 07:19 +0200
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E.R." <robin_listas@es.invalid> - 2026-06-12 12:19 +0200
        Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-12 15:59 -0500
      Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Theo <theom+news@chiark.greenend.org.uk> - 2026-06-12 23:11 +0100
        Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E. R." <robin_listas@es.invalid> - 2026-06-14 15:05 +0200
          Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-14 20:18 -0500
            Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E. R." <robin_listas@es.invalid> - 2026-06-15 09:24 +0200
              Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner VanguardLH <V@nguard.LH> - 2026-06-15 08:14 -0500
                Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner Theo <theom+news@chiark.greenend.org.uk> - 2026-06-15 16:29 +0100
                Re: Android will detect calls with spoofed numbers by sending a real-time RCS message to the legitimate owner "Carlos E. R." <robin_listas@es.invalid> - 2026-06-15 21:21 +0200

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