Mobile Card Readers for Small Businesses: Cost, Connectivity and Limits

LAST REVIEWED 2026-09-06

How mobile readers work

Mobile card readers are compact devices that pair with a smartphone or tablet via Bluetooth. The reader captures the card details and communicates with an app on the phone, which processes the payment over the internet or mobile data network. The phone acts as the terminal's brain, handling the transaction logic, receipt generation, and sometimes even the battery for the reader.

These readers are designed for businesses that need to take payments on the go, such as market stalls, delivery services, or home-based businesses. They are typically powered by a rechargeable battery, which can last for a day of moderate use, but the phone's battery is also a critical factor. If the phone dies, the reader becomes useless.

Connectivity is another key aspect. The reader and phone communicate via Bluetooth, which has a limited range of about 10 metres. The phone must have a reliable internet connection, either through Wi-Fi or a mobile data plan, to authorise transactions. Some providers offer offline mode, but this is not universal and may have restrictions.

Security is handled through encryption and tokenisation, with the reader and app complying with PCI DSS standards. The card data is encrypted from the moment it is read, and the provider handles the secure transmission to the acquiring bank.

Hardware prices

The cost of mobile card readers varies by provider and model. The lowest published UK price on publish day is £29 for a basic Bluetooth reader. This price is often subsidised by the provider, who recoups the cost through transaction fees. Some providers offer the reader for free if you sign a contract, but the £29 price is typically for a pay-as-you-go arrangement, where you pay a higher per-transaction rate.

More advanced readers with features like built-in printers or longer battery life can cost more, sometimes exceeding £100. However, for many small businesses, the £29 reader is sufficient for occasional or low-volume sales.

It is important to consider the total cost of ownership. A cheap reader might have higher transaction fees, while a more expensive one might come with lower rates. Providers often offer bundle deals that include the reader and a merchant account.

When comparing prices, look at the upfront cost, any monthly fees, and the transaction rates. The £29 reader is a popular entry point, but always check the full terms and conditions.

Transaction rates

Transaction rates for mobile card readers are typically higher than for countertop terminals, reflecting the convenience and lower hardware cost. For a pay-as-you-go reader like the £29 model, the rate might be around 1.5% to 2% per transaction, but the exact figure is not published in the brief. Providers often charge a flat percentage plus a small fixed fee, such as 1.75% + 2p.

Some providers offer lower rates if you commit to a monthly subscription, but this can increase the overall cost for low-volume users. The UK's interchange fee caps are 0.2% for consumer debit cards and 0.3% for consumer credit cards, but these are not the only costs; the provider adds its own margin.

For small businesses, it is crucial to compare the effective rate, which includes all fees, not just the headline percentage. Some providers advertise a low rate but add hidden charges for chargebacks, refunds, or monthly statements.

Always read the terms to understand the PAYG rate attached to the £29 reader. The rate may vary depending on the card type, with credit cards often costing more than debit.

Receipts and tips

Mobile card readers typically do not print paper receipts. Instead, they send digital receipts via email or SMS, which is convenient for customers and reduces paper waste. The app usually allows you to customise the receipt with your business logo and details.

Tips can be handled in two ways: pre-set tip amounts on the reader screen or a tip option on the receipt. Some readers allow the customer to add a tip before tapping, while others let you send a payment link for the tip later. The ability to accept tips is valuable for service businesses like hairdressers or taxi drivers.

Digital receipts are stored in the app, making it easy to track sales and manage accounting. However, some customers may prefer a physical receipt, so you might need to invest in a portable printer if that is a common request.

When using a £29 reader, the receipt functionality is entirely dependent on the app. Ensure the app is up to date to avoid glitches. Tips are subject to the same transaction fees as regular sales, so factor that into your pricing.

Battery and Bluetooth limits

The battery life of a mobile card reader is a practical concern. Most readers have a rechargeable battery that can last for a full day of typical use, but heavy usage or leaving the reader on can drain it faster. The phone's battery is equally important, as the app consumes power. It is advisable to carry a power bank for long days.

Bluetooth connectivity has a range of about 10 metres, but obstacles like walls can reduce this. The reader and phone must be within range, and interference from other devices can cause disconnections. If the Bluetooth connection drops, the transaction may fail, so it is wise to keep the phone close.

Some readers have a battery indicator in the app, allowing you to monitor the charge. Charging is typically via a USB cable, and a full charge takes a couple of hours.

These limitations mean that mobile readers are best for low to moderate transaction volumes. If you process many transactions in a busy environment, you might experience battery or connectivity issues, which could lead to lost sales.

When to upgrade

Mobile card readers are an excellent starting point, but there comes a time when upgrading to a more robust solution is necessary. If your transaction volume increases significantly, the per-transaction costs of a PAYG reader may outweigh the hardware savings. A countertop terminal with a lower rate could be more cost-effective.

Another reason to upgrade is if you need features like a built-in printer, faster chip and PIN processing, or the ability to handle contactless payments at a distance. Some mobile readers have limited functionality, such as not supporting certain card types or requiring a signature for larger amounts.

Battery and connectivity issues can also prompt an upgrade. If you frequently run out of battery or experience Bluetooth dropouts, a dedicated terminal with a stable power source and wired internet connection might be better.

Finally, consider the customer experience. If you are processing high-value transactions, customers may expect a more professional setup. Upgrading to a terminal with a larger screen and receipt printer can enhance trust.

When upgrading, compare the total costs, including hardware, transaction fees, and any contract terms. The UK's Payment Systems Regulator has capped initial terminal lease terms at 18 months, so you are not locked in for too long.

Frequently asked questions

Do I need a phone for a mobile reader?

Yes, mobile card readers are designed to work with a smartphone or tablet. The reader connects to the phone via Bluetooth and uses the phone's app to process transactions. The phone provides the internet connection and the user interface. Without a phone, the reader cannot function. Some providers offer standalone terminals, but those are not considered mobile readers in the same category.

How much is a card reader?

The lowest published UK mobile reader hardware price is £29, but prices can vary depending on the provider and features. Some readers are offered for free with a contract, while more advanced models can cost over £100. The £29 reader is typically a basic Bluetooth model with a pay-as-you-go rate. Always consider the total cost, including transaction fees, when comparing prices.

Can I take payments with no signal?

Most mobile readers require an internet connection on your phone to authorise transactions. If you have no signal, you cannot process payments in real time. Some providers offer an offline mode that stores transactions and processes them later, but this is not standard and may have restrictions, such as a maximum transaction value. Check with your provider for offline capabilities.

Do mobile readers print receipts?

Most mobile readers do not have a built-in printer. Instead, they send digital receipts via email or SMS. This is convenient and eco-friendly. If you need paper receipts, you can purchase a separate portable Bluetooth printer that works with the app. Some higher-end mobile readers may have an optional printer attachment, but the basic £29 model does not.

Is a mobile reader secure?

Yes, mobile card readers are secure when they comply with PCI DSS standards. The card data is encrypted from the moment it is read, and the provider handles the secure transmission. The reader and app must meet security requirements set by the payment card industry. Always use a reputable provider and keep the app updated to ensure the latest security patches.