---
title: "How do I use my V400m card terminal without Wi-Fi?"
slug: "how-do-i-use-my-v400m-card-terminal-without-wi-fi"
updated: 2026-06-16T13:00:34Z
published: 2026-06-16T18:16:39Z
canonical: "mysupport.roller.software/how-do-i-use-my-v400m-card-terminal-without-wi-fi"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://mysupport.roller.software/llms.txt
> Use this file to discover all available pages before exploring further.

# How do I use my V400m card terminal without Wi-Fi?

## Introduction

You may occasionally experience a Wi-Fi outage that causes your V400m card terminal to lose its connection to the local network. When this happens, the terminal can’t receive the transaction data it needs from ROLLER POS to process payments.

## Solution

If your local Wi-Fi is unavailable, your v400m card terminal can continue processing payments using cellular data. The v400m supports 4G cellular connectivity, allowing it to stay connected to ROLLER POS during a Wi-Fi outage.

> [!WARNING]
> The v400m requires a SIM card to use cellular data. The SIM card is pre-installed in the terminal.

## Switch your v400m from Wi-Fi to cellular data

1. Press **9 + Green** on the keypad to open **Settings**.
2. Select **Network**.
3. Enter **0166** when prompted for the passcode.
4. Select **Wi-Fi** and toggle Wi-Fi off.
5. Select the back arrow to return to the **Network** menu.
6. Select **Cellular** and confirm the status is **Active**.

Once cellular is active, the terminal can continue processing payments until Wi-Fi is restored.

## Learn more

[ROLLER Payments card terminal troubleshooting](/v1/docs/troubleshoot-roller-payments-card-terminals)

## Related

- [Minimum hardware and operating requirements for ROLLER](/minimum-hardware-and-operating-requirements-for-roller.md)
- [Configure your network for ROLLER Payments terminals](/configure-your-network-for-roller-payments-terminals.md)
- [Add staff members as billing contacts](/add-staff-members-as-billing-contacts.md)
- [Set up ROLLER Payments terminals](/set-up-roller-payments-terminals.md)
- [Troubleshoot ROLLER Payments card terminals](/troubleshoot-roller-payments-card-terminals.md)