Tandem Customer Care Number: How to Reach the Right Support Quickly and Safely

Step 1: Identify Which “Tandem” You Need

Several well-known organizations share the name “Tandem,” and each has different customer care channels. The two most searched are Tandem Diabetes Care (a U.S.-based medical device manufacturer best known for the t:slim X2 insulin pump) and Tandem Bank (a UK-based digital bank). There is also Tandem, the language-exchange app, which primarily offers online support with no public call center. Picking the correct organization ensures you get the right number and avoid scams.

Tandem Diabetes Care, Inc. (founded in 2006; NASDAQ: TNDM) provides insulin pumps and related software such as Control-IQ and the t:connect mobile app. Their official site is tandemdiabetes.com. Tandem Bank (brand launched in the mid-2010s and expanded through the acquisition of Harrods Bank in 2018) offers savings products, green home improvement finance, and credit services in the UK; their official site is tandem.co.uk. The Tandem language app is at tandem.net and typically handles support by email or in-app help rather than by phone.

If you are unsure which Tandem you need, check your product, app, or card. Medical device users should look for the pump’s model and the t:connect app branding. Banking customers should confirm the UK debit/credit card branding and log into the Tandem app. For the language app, open Settings > Help within the app or on tandem.net.

Tandem Diabetes Care (Insulin Pumps) — Customer Care Number and When to Use It

For Tandem Diabetes Care customers in the United States, the 24/7 Technical Support line listed on tandemdiabetes.com is 877-801-6901. Use this number for pump alarms, software questions (e.g., Control-IQ or Basal-IQ), infusion set or cartridge issues, connectivity to CGM systems, and time-sensitive troubleshooting. Technical Support operates around the clock, 365 days a year, because pump-related concerns can occur at any hour.

For non-urgent matters like warranty checks, supply replacements, or insurance/billing questions, start at tandemdiabetes.com/support to submit a request or to find region-specific contact details. If you are outside the U.S., don’t rely on U.S. numbers—go to the website’s country selector and choose your region to obtain the correct local distributor or customer care line. Never use a phone number found solely on social media or in an unsolicited message.

Important: customer care cannot provide medical advice or manage acute emergencies. If you are experiencing symptoms of severe hypo- or hyperglycemia, call local emergency services immediately (e.g., 911 in the U.S.) before contacting technical support. When you do call, be near your pump and CGM receiver/phone so you can read exact alerts, error codes, and firmware versions to the agent.

What to Have Ready Before You Call (Tandem Diabetes Care)

Having a few details at hand will shorten your call. Your pump’s serial number (S/N) appears both on the device label and in the pump menu. On a t:slim X2, you can typically find software and firmware info in the device’s “System” or “About” screen; the t:connect mobile app can also show recent syncs, last bolus time, and alert history that support may ask about.

If you are calling about supplies, keep your last order number and the lot number of your infusion sets or cartridges. For connectivity issues, note your phone model (e.g., iPhone 13, iOS 17.5) or Android device and OS version, plus your CGM transmitter ID. If an alarm occurred, write down the exact wording and the time it started.

• Pump serial number (S/N), firmware/software version, and battery level at time of issue
• Exact alert/error code and timestamp; last successful bolus and basal profile name
• Infusion set/cartridge lot numbers and insertion/change timestamps
• CGM brand/model, transmitter ID, and sensor start date/time
• Phone make/model, OS version, and t:connect app version
• Shipping address, insurance details (if relevant), and recent order numbers

Tandem Bank (UK) — How to Reach the Right Team Safely

If you are a Tandem Bank customer in the UK, the safest way to obtain the correct phone number is from within the official Tandem app or at the Help/Contact pages on tandem.co.uk. The bank may provide different contact numbers for general servicing, savings products, credit/loan queries, and fraud or lost/stolen cards. Because numbers and hours can change, always verify the latest details directly on the site or app before calling.

For urgent card problems (lost, stolen, or suspected fraud), use the “freeze” or “block” card feature in the app immediately, then follow the in-app instructions to reach the appropriate team. UK calling conventions matter: 0800/0808 numbers are free from most UK landlines and mobiles; 03 numbers are charged at standard geographic rates and usually included in bundle minutes. Tandem Bank will not ask you to call premium 09 numbers or request one-time passcodes (OTPs) over the phone to move money to a “safe account.”

To avoid misdials, avoid numbers found in online ads or forum posts. Instead, open the Tandem app, navigate to Support or Help, and tap “Call us” or “Chat.” If you’re abroad, use the international contact details shown on tandem.co.uk/contact or the “Help” section in the app, which will list the correct international formats and opening hours.

Verify Any Tandem Customer Care Number to Avoid Scams

Financial services and medical device brands are common targets for impersonation. Treat any unsolicited call, text, or email that urges you to “call back immediately” with caution. A few quick checks will help you confirm you’re speaking to the real Tandem.

Only trust numbers published on official channels: the organization’s app, the company’s domain, and printed materials that came with your device or bank card. If a number reaches you by text or social media, independently verify it against the official website before dialing. When in doubt, hang up and initiate the call yourself using the official contact page.

• Check the number against the official domain: tandemdiabetes.com/support or tandem.co.uk/help/contact
• Use the in-app “Call us” button (banking) or the support page’s click-to-call to avoid mistyping
• Never share full passwords, full card numbers, or OTPs; legitimate agents won’t ask for these
• If contacted unexpectedly, hang up and redial using the number from the official site/app
• Confirm the agent’s name, team, and a case/reference ID; note the date and time of the call
• For international calls, use the country-specific page to get the correct format and hours

Faster Resolutions and Escalation Tips

Describe the issue concisely and chronologically: when it started, what changed just before (new phone OS, new sensor session, travel/time zone shift), what steps you tried, and what happened next. Provide screenshots of alerts or errors if the channel allows. This approach reduces back-and-forth and helps the agent triage quickly—often saving 5–10 minutes per case.

Ask for the expected next step and timeframe before ending the call (for example, “replacement dispatch within 1 business day,” or “specialist review in 24–48 hours”). Keep your case number handy for follow-ups. If the matter is urgent (e.g., pump usability or suspected card fraud), state that clearly at the start so your call can be prioritized. For non-urgent questions, consider secure messaging or chat in the app or support portal, which can be more convenient and provides a written record.

Quick Summary of the Most-Searched Number

For Tandem Diabetes Care (U.S.) pump users, the 24/7 Technical Support line published on tandemdiabetes.com is 877-801-6901. For Tandem Bank (UK), always retrieve the current customer care and fraud numbers from within the official Tandem app or at tandem.co.uk, as lines and hours vary by product and location.

When in doubt, verify the number on the official website or app before you dial. This simple step prevents misdials, speeds up your resolution, and protects you from common impersonation scams.

What is the phone number for Tandem X2?

(877) 801-6901
Contact Information
Customers in the U.S. with questions about this recall should contact Tandem Diabetes Care Technical Support Team at (877) 801-6901.

Is tandem technical support 24-7?

Impacted customers in the U.S. with questions about this recall can contact the Tandem Diabetes Care Technical Support Team 24 hours a day, 7 days a week at [email protected] or (877) 801-6901.

How to order tandem diabetes supplies?

When you log into your Tandem Source account, if you are eligible for a supply reorder, you will see it listed on the Orders screen. Note: If you want to change your supply order, please call our Supply Team at (877) 801-6901. We will work with your insurance provider to determine your estimated patient responsibility.

How do I contact Tandem support?

(877) 801-6901
Send a Message. If you are already using Tandem products and need assistance, please call our Technical Support Team at (877) 801-6901.