Almost every food business needs to do the same four things at the counter: total up what was ordered, apply the right price and tax, take the money, and hand over a receipt. Everything else a point of sale claims to do sits on top of those four.

The question worth asking is not "which POS is best". It is how much hardware and contract do I need to buy to do those four things well, and the honest answer for most small and mid-sized places is: much less than they were sold.

What a mobile POS actually is

An app on an Android phone, paired over Bluetooth with a thermal receipt printer. Your menu and prices live in the app. Staff tap items, the bill totals, the payment method is recorded, and the receipt prints in about two seconds.

That is the whole mechanism. The reason it works is that the expensive part of a traditional terminal, the computer, is a device your staff already carry.

What you give up, honestly

Anyone who tells you a phone replaces every terminal in every setting is selling. A dedicated terminal is genuinely better in some situations:

Very high volume at a single fixed till. A large screen with physical hardware is faster when one person bills hundreds of covers from one spot without moving.
Heavy peripheral setups. Cash drawers, weighing scales, barcode scanners and customer-facing displays all attach more simply to a terminal built for them.
Staff who share one device all day. A phone is personal. A till is not.

If you are a large format restaurant with a dedicated cashier station and a queue out the door, a terminal earns its keep. If you are a café, a cloud kitchen, a small restaurant, a counter service place or a stall, it very likely does not.

What you gain

No lease and no install. The hardware cost is a receipt printer, which is a commodity item, rather than a terminal on a multi-year contract.
You can bill where the customer is. At the table, at the door, on the pavement seating. The till goes to them.
Adding a device is logging in. On a busy evening a second person can start billing on their own phone. No per-terminal licence.
It survives a power cut better than a counter full of equipment. Phones have batteries. Most printers do too.

The question that actually matters: does it talk to everything else?

This is where most setups fall down, and it has nothing to do with hardware. A lot of places end up with a billing system that knows nothing about their online orders, a delivery channel that knows nothing about their loyalty programme, and a spreadsheet at the end of the month trying to make the three agree.

Three specific things to check before you buy anything:

Is the menu shared? If you change a price, does it change at the counter, on the QR menu and in the delivery app at the same time, or do you edit it three times and eventually forget one?
Does a counter sale create a customer? A walk-in who pays cash is anonymous by default. If you can attach a phone number at billing, that person can earn points and be brought back. If you cannot, every counter sale is a stranger forever.
Is there one set of numbers? Your best day should be visible in one place, counter and online together, without exporting anything.

A cheap POS that answers none of those costs more over a year than a slightly dearer one that answers all three, because the difference gets paid in your time and in customers you never followed up.

How to decide

Roughly, and without being cute about it:

Café, small restaurant, counter service, cloud kitchen, stall: a mobile POS is very likely the right call, and the money saved on hardware is better spent on the parts that bring customers back.
Multi-till, high-volume, heavy peripherals: keep a terminal for the main station, and consider mobile billing as a second channel for table settlement and peak hours.

What to ask any vendor

What exactly do I have to buy, and do I own it or lease it?
Does the price change if my sales go up, or if I add a device?
Can I edit my menu once and have it apply everywhere?
Can a counter sale be linked to a customer and earn loyalty?
What happens to my data if I leave?

Those five questions separate a billing machine from something that actually helps the business grow, and they are worth asking before the demo gets to the feature list.

Retova's mobile POS runs on an Android phone with a Bluetooth receipt printer, and shares one menu, one customer list and one set of reports withrestaurant ordering and café QR ordering. You can take the POS on its own. When you want to see it print a real receipt from your own menu,get in touch.

Mobile POS vs a traditional POS terminal