T-Mobile Data Breach Claims

Millions of customers affected. Are you one of them? If so, our group action can help.

Get justice for the T-Mobile data breach

In November 2019, T-Mobile suffered a severe data breach. Over a million pre-paid customers are believed to be affected.

According to T-Mobile, the following data might have been exposed in the data breach:

This information could be used by cybercriminals to commit fraud/identity theft and other crimes.

We have launched a group action against T-Mobile. Group actions can be a powerful tool and can have a bigger impact than a single claim.


Contact us today for a free, no-obligation, assessment of your case.

Why claim T-Mobile data breach compensation?

Hold T-Mobile to account for failing to protect your private information.

Receive financial compensation for your losses.

Force companies to implement better data security.

Holding T-Mobile to account

T-Mobile was very unforthcoming about the data hack and did not provide additional information about the hack at the time of the breach.

For victims of the data breach, this stance was both unhelpful and potentially dangerous. Not least because, until they know the full picture, T-Mobile customers could still be at risk.


T-Mobile Data Breach Timeline

  • November 2019
    T-Mobile suffered a severe data breach. Over a million pre-paid customers are believed to be affected.
  • March 2020
    T-Mobile begun notifying customers of ANOTHER security breach.

Current situation

Our lawyers are currently considering launching a group litigation action for everyone who has had their data privacy violated in the T-Mobile data breach. This will depend on the details as they emerge. And specifically, how this breach relates to the UK.


Latest News

individual finance claims

T-Mobile confirms that it has breached customer data – again

T-Mobile has admitted that, once again, hackers have accessed its systems. The confirmation comes after some T-Mobile customer data was found listed for sale on a cybercriminal forum. The seller is asking for 6 bitcoin (around £203,000) for a 30 million subset of the data. The seller claims to be selling the rest of the data privately.

Read More »



Find out more about making a group action claim for compensation against T-Mobile.



What does no-win, no-fee actually mean and are there really no costs if you appoint us?

Why use Keller Lenkner UK to make a claim?

We are one of the most experienced multi-claimant law firms in the UK.

Our GDPR, data breach and cybercrime specialists have a combined experience of over 50 years.

We represent clients in group actions and individual cases with innovation, resources, and expertise.

We work with expert barristers to ensure you get the very best level of legal support available.

We have all the resources and global expertise necessary to take on complicated cases and win.

We have offices in Chancery Lane London, Birmingham and Liverpool, and the technology to provide a nationwide service, so we can help clients across England & Wales.

We use technology to deliver a better legal experience to our clients.

We work on a no-win, no-fee basis.

We make the process straightforward and hassle-free.


Your questions answered

See our answers to the FAQs we get asked about the T-Mobile Data Breach.

FAQs about the T-Mobile data breach

So far, the details are vague. But it does look like a hacker was involved.

T-Mobile hasn’t disclosed how the breach took place, whether data was stolen or how long the data was exposed for. However, we do know that the breach was spotted in early November and that the relevant authorities have since been alerted.

T-Mobile has said that all affected individuals have been notified. However, it also says that, if you don’t receive a notification, this could be because they don’t have up-to-date contact information for you. So, all customers should check that they have up-to-date contact details on their account in the event that T-Mobile needs to reach them.

If you are a T-Mobile customer, it is also worth checking your spam folder and any old email accounts in case the email has gone there.

If you are/were a Prepaid T-Mobile customer, and you have not received a notification and would like to confirm if your information was impacted, please email privacy@t-mobile.com

The attack was spotted in early November 2019. And, according to T-Mobile, it moved to shut it down “immediately”. The company has also notified its users of the hack. However, for victims of this breach, that could be too little too late.

To join our T-Mobile data breach group action compensation claim, you will need to register with us. This guarantees that you will form part of the compensation claims that will be lodged by us.

  • Evidence that you have received an email from T-Mobile saying your details have been affected
  • Evidence of any financial losses, distress, and/or inconvenience you have suffered as a result of the data breach. This includes things like:
    • Bank statements
    • Correspondence (letters, emails, etc.) with banks, credit card providers, credit reference agencies, etc.
    • Credit score reports (with dates of any dips)
    • Details about medical appointments/prescriptions that relate to this data breach (e.g. due to distress/stress)
  • Evidence of any fraudulent transactions, fraud attempts, alerts, cancelled cards that relate specifically to the card details breached
  • Evidence of increased spam
    Anything else that may be relevant to support your claim
  • Confirmation that, as far as you are aware, your information was not put at risk by another data breach.

If you cannot find this information, but T-Mobile has told you that you were involved in the data breach, just let us have the information you can find.

What can you claim for?

While each case is judged on its own merits, there are some things we would typically look for when it comes to when claiming compensation following a data breach, cybercrime or other GDPR violation:

Financial loses

With stolen data, cybercriminals can make purchases using your bank and credit cards, apply for credit in your name, set up fraudulent bank accounts and access your existing online accounts.


GDPR failures, cybercrime and data breaches can have a significant impact on you, both mentally and physically. They can cause or exacerbate anxiety, stress and other psychological conditions.

Loss of privacy

Your data has value, and organisations must be held to account if they fail to protect your right to data privacy or otherwise do not uphold your GDPR rights.

How to protect yourself following a data breach or cybercrime

  • Contact your bank or credit card provider immediately if your financial data has been exposed.
  • Check all bills and emails for goods or services you have not ordered.
  • Check your bank account for unfamiliar transactions.
  • Alert your bank or credit card provider immediately if there is any suspicious activity.
  • Monitor your credit score for any unexpected dips.
  • Call Credit, Experian and Equifax to ensure credit isn’t taken out in your name.
  • Never provide your PIN or full password to anyone (even someone claiming to be from your bank).
  • Never been pressured into moving money to another account for fraud reasons. A legitimate bank won’t ask you to do this.
  • Follow the security instructions provided by the organisation that breached your data.
  • Never automatically click on any suspicious links or downloads in emails or texts.
  • Don’t assume an email or phone call is authentic just because someone has your details.
  • Be careful who you trust – criminals often use scare tactics to try and trick you into revealing your security details.
  • Know that, even if you recognise a name or number, it might not be genuine.
  • Don’t be rushed or pressured into making a decision. A trustworthy organisation would never force you to make a financial transaction on the spot.
  • Never provide your full password, pin or security code to someone over the phone (or via message). If a bank believes a transaction has been fraudulent, they will not ask for this information to cancel the transaction.
  • Listen to your instincts and ask questions if something feels “off”.
  • Refuse requests for personal or financial information and stop discussions if you are at all unsure.
  • Contact your bank or financial service provider on a number you know and trust to check if a communication is genuine.
  • Be cautious of unsolicited communications that refer you to a web page asking for personal data.
  • Don’t accept friend requests from people you don’t know on social media.
  • Review your online privacy settings.
  • Report suspected fraud attempts to the police and Action Fraud.
  • Register with the Cifas protective registration service to slow down credit applications made in your name.
  • Change your passwords regularly and use a different password for every account (a password manager can help with this).
  • Protect your devices with up-to-date internet security software.