The closure of ageing 3G networks across the UK has opened an unexpected opportunity for cybercriminals. As providers move customers towards faster 4G and 5G services, scammers have begun impersonating telecom companies in an attempt to steal personal information.
Virgin Media O2 is the latest operator to warn of such activity, telling customers to remain cautious after reports of fraudulent emails claiming that users must switch to a new 5G SIM card. The company says the messages are designed to look legitimate, using familiar branding and urgent language to pressure recipients into responding.
Fraudsters Exploit Confusion around the 3G Network Shutdown
The scam centres on emails sent to customers that appear to come from Virgin Media O2. According to reports cited by technology outlets, the messages typically carry the subject line “Alert: Switch to Your New 5G SIM for a Faster, Stronger Network.” The emails claim that recipients must upgrade their SIM card to continue using mobile services following the company’s 3G switch-off.
In reality, Virgin Media O2 says it did not send these emails and has urged customers not to click on any links or reply to the messages. According to the company, scammers are using official-looking logos and formatting to make the emails appear genuine, increasing the likelihood that recipients will trust them.
Some fraudsters are reportedly taking the deception further by sending fake SIM cards through the post and asking recipients to activate them using a four-digit PIN. According to technology reports covering the warning, the email may also instruct users to log in to the O2 mobile application using a password supplied by the scammers. A button labelled “Contact Us” can redirect victims to the criminals rather than to Virgin Media O2’s customer service.
If successful, the attackers could gain access to customers’ accounts or gather enough personal information to break into other online services, including banking platforms. According to the company, customers who receive such emails should delete them immediately and avoid interacting with any embedded links.
Telecom Provider Urges Vigilance as Phishing Attempts Rise
Virgin Media O2 says the scam is exploiting the ongoing phase-out of 3G technology in the UK. The company began shutting down its 3G network in April last year, with the programme scheduled to conclude by late 2025 or early 2026, according to company information cited in news reports.
The wider transition away from 3G was agreed in 2021 between the UK government and major mobile network operators, including Vodafone, EE and Three. The shift allows telecom companies to reallocate radio spectrum to newer technologies such as 4G and 5G, which offer faster speeds and more reliable connections.
Although the change is unlikely to affect most customers (particularly those using phones produced within the last decade) the announcement has created an opportunity for scammers seeking to exploit uncertainty. According to Virgin Media O2, criminals often rely on urgency and confusion to pressure people into revealing sensitive details.
A company spokesperson said scammers “will stop at nothing to target victims”, warning customers to treat unexpected emails with caution. According to the provider, anyone who receives a suspicious message should avoid engaging with it and instead report it by forwarding the email to [email protected].
Virgin Media O2 has also encouraged users to report suspicious texts or calls by sending them to 7726, a free service used by UK mobile operators to track and block fraudulent communications. The company says reports from customers have already helped it block more than one billion scam messages.
