Written for people who run one Meta, Google, or TikTok Business Manager on one European 4G modem: what actually changed this year, and how to connect without mixing HTTP and SOCKS5. Setup and carrier pages live on resources.
If you run Google Ads in Europe, August 2026 changed how Google uses the IP of someone who visits a page you tagged. It did not change the IP of the laptop you use to open Ads Manager.
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If someone is still selling you a “cookieless 2026” mobile proxy, they are a year behind. Chrome kept third-party cookies. In October 2025 Google retired Topics, Protected Audience, Attribution Reporting, and IP Protection.
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From March 2026 Meta labels the old “beneficiary” as the “advertiser.” If Business Manager asks you to verify, it wants identity documents or a matching business record. Changing your 4G IP does not finish that form.
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Other customers on the same SIM is the whole difference between a pool and a dedicated modem. You can see it by watching your public IP for an hour without requesting a change.
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Safari, Chrome, Firefox, and Edge need the HTTP endpoint. SOCKS5 is a different port for apps. Mixing them makes a working modem look dead.
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A page that loads only proves the tunnel is up. Confirm the exit IP, watch it for an hour, then try a login you can afford to lose.
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When the browser says the proxy refused the connection, start with the password paste, then HTTP versus SOCKS, then any IP change still running. The modem is often fine.
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