Fake Cell Towers in Canada: How to Block 2G Downgrade Attacks & Protect Your Phone
TL;DR: Criminals are using portable devices known as "SMS blasters" to force nearby smartphones onto outdated 2G networks. This 2G downgrade allows them to send convincing "smishing" (SMS phishing) texts pretending to be legitimate brands like Canada Post or 407 ETR. You can significantly reduce your risk by disabling 2G connectivity on your device. What is an SMS Blaster? An SMS blaster, often called a False Base Station (FBS) or IMSI-catcher, is a device that mimics a legitimate cell tower. When you are in range, your phone may automatically connect to this rogue signal instead of a secure TELUS tower. Once your device is connected, the attacker can: Force a 2G Downgrade: Most modern phones (LTE/5G) are designed to fall back to older networks if necessary. The fake tower exploits this by broadcasting a strong signal that tricks your phone into dropping its secure connection for the unencrypted 2G network. Send Smishing Texts: They use this unencrypted connection to push fake SMS messages (e.g., "URGENT: Outstanding toll fees for 407 ETR"). Cause Temporary Interruptions: You may notice your phone briefly loses signal or cannot place calls/use data while connected to the rogue tower. How to Block 2G Downgrade Attacks The most effective defense is to manually restrict your phone from connecting to 2G networks. Android Devices Steps vary by manufacturer, but you can typically find the toggle here: Device Path Samsung Galaxy Settings > Connections > Mobile Networks > Allow 2G (Set to OFF) Pixel Settings > Network and Internet > Mobile Network Security > Enable 2G network protection Other Android Settings > Network and Internet > SIMs > TELUS - StaySafe > Allow 2G (Set to OFF) iPhone (iOS) Apple does not currently offer a simple "Turn off 2G" toggle. If you are concerned about targeted threats, the only built-in method to restrict these network types is Lockdown Mode. Go to Settings > Privacy & Security. Scroll to the bottom and select Lockdown Mode. Tap Turn On Lockdown Mode. Note: Lockdown Mode is an extreme security setting. It rejects 2G/3G networks but also limits some browsing features, blocks many message attachments, and restricts FaceTime calls from unknown numbers. What to do if you receive a suspicious text If you receive an unexpected message regarding urgent payments, toll fees, or delivery issues: Do Not Click Links: These are often designed to steal your credentials or financial information. Verify Directly: If you are unsure if a message is legitimate, contact the organization directly using a phone number or website you have sourced independently never use the contact info provided in the suspicious text. Report It: Forward any suspicious text messages directly to 7726 (SPAM on most mobile keypads) so we can investigate and notify the network. Contact Authorities: If you believe you have fallen victim to fraud, please contact the Canadian Anti-Fraud Centre (CAFC) immediately. FR version
