Best Card Machine for a Mobile Mechanic in the UK
Mobile mechanics need a 4G-enabled card machine that works at customer kerbside without WiFi. SumUp Solo (£99, 1.69 per cent), Dojo Go (£40 per month, 0.8 per cent typical), Zettle Terminal (£149, 1.75 per cent) and Square Terminal (£149, 1.75 per cent) all run on built-in 4G with multi-network SIMs. Battery lasts a full working day. Receipts can be emailed, texted or printed (Dojo Go and Square Terminal have integrated printers).
What this means for your business
A mobile mechanic does not have a fixed venue, so WiFi-only or Bluetooth-paired devices fail in the real working pattern of "kerbside call out, sometimes on the M25 hard shoulder". 4G-enabled standalone devices solve this. Multi-network SIMs (which most major brands now ship with) roam between EE, Vodafone, O2 and Three automatically, so there are no dead spots in usable urban or motorway-corridor signal.
Battery life matters because customer driveways and roadside jobs do not have power. SumUp Solo, Zettle Terminal and Square Terminal all run a working day on one charge if you keep the screen brightness moderate. Dojo Go is similar. Carrying a power bank with a USB-C output covers an unusually busy day. Avoid devices that need a docking station, those are designed for a fixed counter and become useless on the move.
Receipts are often a sticking point. Some customers want paper for warranty claims or insurance work, others are happy with email. Dojo Go and Square Terminal have built-in printers, which is the cleanest solution. SumUp Solo and Zettle Terminal email or text receipts only, which works fine for retail customers but can be friction with insurance work. Decide before buying which receipt style your customer mix needs.
Key points
- 4G-enabled standalone is the only realistic format, Bluetooth pairing fails in the field
- Multi-network SIM roams EE, Vodafone, O2 and Three automatically on most major brands
- Battery life one full working day on SumUp Solo, Dojo Go, Zettle Terminal, Square Terminal
- Printed receipts come from Dojo Go and Square Terminal, others send email or SMS only
- Dojo Go at around 0.8 per cent works out cheaper above £2,500 monthly card volume
- SumUp Solo at £99 outright and 1.69 per cent wins for sub-£2,500 volume mobile trades
- Most devices accept Apple Pay, Google Pay and Amex out of the box, check Amex pricing premium
Common pitfalls
- Choosing a device on price without checking signal coverage in your typical job area
- Forgetting that diesel forecourts and underground car parks often kill 4G signal, have a manual entry backup or a refresh-pay flow
- Buying a printer-equipped device when 90 per cent of customers want emailed receipts, paying for unused capability
- Assuming the same device works for parts and labour invoices, some VAT setups need separate transaction notes
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Open quote form →Related questions
Can I take a deposit over the phone for a callout?
Yes. Most card machine providers also issue a virtual terminal for keyed-in (MOTO) transactions taken over the phone. Pricing is higher (typically 2.5 to 3.5 per cent) because MOTO carries more chargeback risk. Useful for callout deposits before driving to the customer.
What happens if there is no signal at the customer location?
Most modern devices store a small queue of transactions offline and submit when signal returns, but this is risky because the customer card may decline when actually authorised. Better to take details, drive out of the dead spot and authorise normally, then text the receipt.
Director, MerchantHQ
Oliver leads MerchantHQ's editorial and comparison research. With a background in UK commercial finance, he oversees provider analysis, rate verification, and industry reporting across all verticals.
Last reviewed: 18 May 2026