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A mobile POS (point-of-sale) system enables businesses to take payments on the go, whether at a food truck, market stall or on the road. With the right mobile POS hardware, retailers, service providers and other mobile businesses can accept card payments from anywhere, turning any space into a checkout counter and every interaction into a smooth customer experience.
This guide takes you through what a mobile POS system is, how it works and what to consider when choosing the best mobile POS system for your business.
What is a mobile POS system?
A mobile POS, or mPOS, is a portable point-of-sale system that runs on a mobile device, such as a smartphone or tablet. It’s designed to take payments and process transactions wherever you’re operating.
When you connect a card reader to your device, you can offer customers various payment methods, including chip and PIN cards, contactless payments and mobile payment options like Apple Pay. For businesses like event vendors, pop-up shops or home services, an mPOS app paired with a portable reader is an ideal solution for accepting payments on the go and serving customers wherever they are.
Some examples of mobile POS systems that allow businesses to take payments away from a traditional checkout counter are Square Reader, Square Terminal and Square Handheld.
How does mPOS work?
Using a mobile POS system is simple. Once you choose mobile POS software for your business, download your POS app, connect a compatible mPOS terminal to your mobile device, and you’re ready to start taking payments over Wi-Fi or mobile data. No wires, no bulky equipment – just a fast, convenient solution for businesses that want to process transactions from any location.
What are the benefits of a mobile POS?
A mobile POS helps businesses accept payments anywhere, making transactions faster and more convenient. Research from the 2025 Square Future of Restaurants report revealed that mobile POS is the payment technology that’s driving the most orders for restaurants.
Some key benefits of using a mobile POS include:
- Faster checkouts: Serve customers quickly and keep lines moving, no matter where you’re selling.
- Flexibility: Take payments on the floor, on the road or at events.
- Lower upfront costs: No bulky hardware or complex setup needed.
- Real-time insights: Monitor sales, inventory and performance in real time.
- Secure payments: Encryption and PCI compliance help protect every transaction.
- Scalable: Easily add more devices or features as your business grows.
- Easy to use: Simple interfaces make it easy to train staff and get started fast.
- All-in-one solution: Modern mPOS systems like Square even let you send invoices, run marketing campaigns and build customer loyalty, all from one app.
At Soho Live Music Club, Square’s mobile POS helps staff take orders around the venue with ease. “I find that with the Square Terminal, it’s a lot less clunky than your traditional point of sale systems,” says Antonio, the General Manager. “The fact that you can move with it makes it really handy.”
What hardware is required to operate a mobile POS?
Mobile POS hardware is typically lightweight and customisable based on your business needs. Simply start with the basics and add what you need. Here’s an overview of the essentials:
Mobile device (tablet or smartphone)
Your mobile device is the core of your mobile POS setup. This could be a smartphone or tablet – either iOS or Android – that runs your POS app. It’s what you’ll use to process sales, access your product catalogue, take payments and manage orders.
Card reader
To accept in-person payments, you’ll pair your mobile device with a card reader. This small, portable piece of hardware connects to your mobile device (via Bluetooth, USB or a headphone jack) and lets you take card and digital wallet payments directly through your POS app. There are a few types of card readers:
- EMV chip card readers (for chip and PIN cards)
- Contactless/NFC readers (for tapping cards or devices with mobile wallets like Apple Pay and Google Pay)
For example, Square Reader is a pocket-sized device that connects wirelessly to your mobile device, and accepts chip and PIN cards, contactless cards and mobile wallet payments, all in one.
Cash register
If you accept cash, a secure cash register is a must. It may be connected to your POS system to open automatically during a cash transaction, or opened manually with a key.
Barcode scanner
For retailers needing faster checkouts and more accurate inventory tracking, a barcode scanner is a valuable add-on. You can use a Bluetooth or USB barcode scanner, or even your device’s built-in camera, depending on your setup.
How to choose the right mPOS
Selecting the best mobile POS for retail or service-based businesses means finding a secure, easy-to-use and affordable setup. Here are the key factors to consider:
Security and compliance
According to the UK Finance Annual Fraud Report, card fraud amounted to £572.6 million in 2024. As such, security is a must for mobile POS payments. Look for PCI compliance, encryption for all payment types (including contactless, chip and PIN and mobile wallets), built-in fraud protection and dedicated support for managing disputes and chargebacks. With Square, all of this is included at no extra cost.
Business needs
Every business runs differently. Consider your industry, where you sell, how many sales you process in a day and what types of payments you accept. Your POS system should match your workflow and flex around your needs, not the other way around.
User-friendly interface
You shouldn’t need a manual to make a sale. Look for mPOS software with clear menus, customisable layouts and fast access to the tools you use most frequently. A user-friendly mPOS helps minimise training time, reduce errors and speed up sales.
Features and integrations
Today’s mPOS systems do more than just process payments. Consider choosing an mPOS system that can support the rest of your operations, too – like inventory management, staff scheduling, marketing automation, customer insights and accounting integrations (like Sage or Xero).
Scalability and flexibility
As your business grows, your mobile POS should grow with you. Look for a system that can adapt, whether that means adding POS registers, expanding to online sales or opening new locations.
Costs and fees
Understanding the costs associated with an mPOS machine and software is essential. Check hardware costs, processing fees and any monthly charges. Some providers charge extras that add up fast. With Square, you get simple, clear rates and no hidden fees, so you know exactly what you’re paying for.
Why choose Square for your mobile POS needs?
Square set out to make mobile payments accessible to all, allowing even small and seasonal businesses to accept card payments. Traditional POS terminals are often bulky and expensive, posing challenges for mobile businesses that operate on a leaner scale. The Square mobile POS app and hardware provide an affordable, portable solution that helps businesses of all sizes easily and flexibly sell on the go.
Unlimited POS terminals
With Square, you can use as many mobile POS terminals as you need with no extra monthly fee. That means multiple team members can take payments simultaneously, which is great for busy events or multi-station setups.
It’s this kind of flexibility that helps Jackie McKinson and Kate Farr, co-owners of Aries Bakehouse, keep things moving when the queue for their baked goods stretches down the street. “We don’t want people queuing outside for a long time,” Farr explains. “We want the experience to be an easy and fun one for them,” so staff work their way down the queue, taking orders on the mobile POS as they go.
Powerful features in your pocket
Even on a smartphone, Square POS packs a punch. You can get notifications for low stock levels, check reports in real time, view customer insights and manage your team from just a single app.
Transparent pricing with no surprises
Square keeps it simple with clear, low-cost rates, and no long-term contracts or hidden fees. The Square mobile POS app is free to download, and transaction fees are just 1.75% per tap, chip and PIN or contactless payment. There are no setup costs or monthly charges – just straightforward, pay-as-you-go pricing.
Hardware options are also affordable, like the contactless and chip and PIN card reader, which is available at a one-time cost of £19 + VAT. It connects wirelessly to your smartphone or tablet and works with all major card types and mobile wallets.
How to set up Square mPOS to accept mobile payments
- Sign up for your free Square account, then download the free Square POS app (iOS or Android).
- Purchase the Square Reader to accept contactless, chip and PIN, and mobile wallet payments.
- Pair the card reader with your mobile device via Bluetooth. Select an item from the item library or key in an amount, and tap Charge. Ask your customer to tap their device or card on the reader, or insert their card in the slot.
- Customers can enter their phone number or email address to receive a digital receipt instantly.
An mPOS that plays nicely with others
The Square mobile POS system integrates seamlessly with third-party apps to help you run your entire business on the go or in your back office. Simplify your accounting with Xero or make eCommerce integrations easy with BigCommerce. Need a custom mPOS? You can work with developers to create a tailored solution for your business using the Square point of sale API.
Is an mPOS the right solution for your business?
A mobile POS system is a smart choice for businesses that want to take credit card payments on the move, such as food vans, plumbers, landscape architects, mobile beauty businesses, electricians, moving companies and artisans at craft fairs, among others. Mobile POS systems allow you to take payments from virtually anywhere, helping you reach customers wherever they are – and giving them a checkout experience that feels just as professional as any shopfront.
Mobile POS FAQ
What is a mPOS?
An mPOS, or mobile point-of-sale system, is a portable way for businesses to accept payments using a smartphone or tablet paired with a card reader. Unlike a traditional till or countertop terminal, an mPOS system lets you take payments on the move – whether you’re working at a market stall, on-site with a customer or at a pop-up event. With features like digital receipts, inventory tracking and customer data, mPOS systems are an ideal fit for modern businesses that operate outside traditional storefronts.
What is the meaning of mobile POS payment?
Mobile POS payment refers to the process of accepting card payments through a portable system using a smartphone or tablet with a card reader attachment. This payment method allows businesses to process transactions anywhere, rather than being limited to a fixed location. Mobile POS payments support various payment types, including chip and PIN cards, contactless payments and digital wallets like Apple Pay and Google Pay.
What is the difference between traditional POS and mobile POS?
A traditional POS system is typically fixed to a counter inside a store and may require more hardware, while a mobile POS system is portable and runs on a smartphone or tablet. Mobile POS systems let you accept payments anywhere without being tied to a single location. They’re designed for businesses that need mobility, like food trucks, service professionals or market vendors, and often come with lower setup costs and simpler pricing.
What are POS mobile devices?
POS mobile devices are smartphones or tablets that are set up to function as a point-of-sale system. When paired with a card reader and POS app, your mobile device becomes your till, sales tracker, receipt printer (digitally) and more – all in one. These devices let you manage your business on the go, from taking payments and managing inventory to reviewing sales and connecting with customers.
Can I use my mobile phone as a POS?
Yes, you can easily use your phone as a full-featured POS system with a mobile POS app (such as the Square POS app). Just download the app, connect a compatible card reader, and you’re ready to take chip and PIN, contactless or mobile wallet payments. Your phone becomes your till, allowing you to manage sales, issue digital receipts, track inventory and serve customers from wherever you are.
Is a mobile POS secure for businesses in the UK?
Yes, mobile POS systems are highly secure for UK businesses when they meet industry standards. Reputable providers like Square use end-to-end encryption and comply with PCI DSS requirements to protect payment data. With Square, you also get 24/7 fraud prevention and payment dispute management at no extra cost.
