Zebra Mobile Troubleshooting

Q: What is Zebra Mobile?

Zebra Mobile provide business mobile services with roaming and a dedicated landline number and can be taken on its own or with Digital Voice and Business Voice

  • Zebra Mobile
    • A  Business Mobile service for users who don’t need apps, collaboration tools and advanced features with roaming included in 39 countries.
    • It delivers a business landline number directly to your mobile device, no apps required.
    • Customer can access the mobile number on the eSIM twinned with the landline number for use with SMS and can present it as the number when dialling out instead of the landline number if preferred.
    • Ideal for sole traders or field workers who want simplicity, privacy, and mobility.
    • Supports call recording unlike typical business mobile services
    • Customers can choose voice-only or optional data bundles

  • Zebra Mobile with Digital Voice & Business Voice

    A fully-featured mobile solution bundled with either Digital Voice or Business Voice, allowing one number to ring across:

    • Your mobile device with the Zebra Mobile eSIM
    • Webex desktop and mobile apps
    • IP desk phones
    • It includes voice-only or optional data bundles, and is ideal for users who need collaboration tools like Webex as well a mobile service when on the move.

Customers can mix users on Digital Voice or Business Voice with Zebra Mobile.

Q: My SIM isn't working, what should I check first?

A: Ensure your device is carrier-unlocked, and is on our supported device list. Restart your device or toggle flight mode to re-register. If using eSIM, verify correct QR installation using the 'Add eSIM' option.


📲 iPhone Installation (Pre-iOS 26) iPhone Guide

iPhone users should follow these steps to ensure the best experience once you have installed the eSIM:

  1. Go to Settings > Mobile Services > Business SIM
  2. Tap Voice & Data and toggle VoLTE → On if its not already

  3. Tap My Number and enter your Vocalised landline number:

    (e.g. +44 20 7123 4567 — the number is included in your welcome email)

  4. Tap Wi-Fi Calling and switch On
  5. Scroll back and switch Data Roaming → On
  6. 🔁 Restart your iPhone to apply the changes

📲 Android Installation

Android guides for Pixel and Samsung:

It is recommended you restart your Android phone after installing the eSIM.

Q: How do I set up data on my device?

A: Make sure mobile data and roaming are enabled in Mobile Settings.

Check your APN settings:

  • iOS: Settings > Mobile Service > Mobile Data Options > Mobile Data Network
  • Android: Settings > Mobile Networks > Access Point Names

If you are using a supported phone then APN information will be automatically configured. If you are using a compatible phone you will need to create the following APNs manually:


Phone Data APN

  • Name: globaldata
  • APN: globaldata
  • If your service is enabled for MMS messaging you will need to set the following fields. Otherwise accept the default values for all fields.
    • MMS proxy: 37.18.129.98
    • MMS Port: 8008
    • MMSC: http://mms.mobileuc.global/

Hotspot Data APN

  • Name: globalhotspot
  • APN: globalhotspot
  • APN Type:
    • Android 14+: Set to ‘tethering’
    • Prior to Android 14: Set to ‘DUN’. Some handsets require full capitalization.

Reboot your phone for added/changed APN data to take effect.

Q: Why Doesn't Call Waiting work when I have Vocalised

A: Most modern dual SIM phones, including iPhones and Android devices, support Dual SIM Dual Standby (DSDS). This means your phone has one radio that alternates between two SIMs to monitor for calls and texts. It’s designed to be battery-efficient, but it does have some limitations.

The limitation: If you’re already on a call using one SIM, the phone can’t listen for incoming calls on the other SIM at the same time. So, if someone tries to call your Vocalised number while you’re on a call using your personal SIM, your phone won’t notify you, and the caller may go straight to voicemail or get a busy tone.

The exception: If Wi-Fi Calling (Voice over WiFi - VoWiFi) is enabled on the SIM you’re using for the active call, the call goes over Wi-Fi rather than the mobile network. In that case, your phone’s radio remains free to listen for calls on the other SIM, so Call Waiting may work as expected.


What you can do

  • Ensure both SIMs support and are set up for VoWiFi, where possible.
  • If receiving calls on both numbers is critical during business hours and using Wi-Fi calling isn't possible, ensure you can receive calls from a softphone app (e.g. Webex) or a deskphone on Business Voice. The Webex mobile App will show an incoming call when on a personal call on the primary SIM.

  • Please see these guides for more information on dual-sim use:

    Apple iPhone

    Samsung Galaxy

    Google Pixel

Q: How do I enable 4G Calling (VoLTE)?

A: Follow these instructions:

  • iOS: Settings > Mobile Service > Business SIM > Voice & Data > Switch VoLTE indicator on (green)
  • Android: Settings > Connections > Mobile Networks > Switch VoLTE indicator on

Q: How can I send and receive SMS messages?

A: SMS is enabled by default on Zebra Mobile and works using the mobile number. We include 1000 SMS per month as a fair use policy.

Q: What is Wi-Fi calling and what do I need to know about it?

A: Wi-Fi Calling allows you to make and receive phone calls and texts using a Wi-Fi network instead of the mobile network. It’s especially useful in buildings or areas with weak mobile signal.


When enabled, your device may choose to place a call over Wi-Fi based on your current network conditions. You’ll see “Wi-Fi” in the status bar during active Wi-Fi Calling sessions, and you can use your phone’s normal dialler, just as you would for a regular call.


Q: When is Wi-Fi calling used?

Wi-Fi Calling is automatically chosen by your device when:

  • You are connected to a Wi-Fi network.
  • Your device determines Wi-Fi offers better connectivity than cellular.
  • You have Wi-Fi Calling enabled in your settings.

👉 iPhones tend to prefer mobile calling by default, even when on Wi-Fi.

You can force Wi-Fi Calling by turning on Airplane Mode and then re-enabling Wi-Fi.


Q: Which devices can I use with Wi-Fi Calling?

  • iPhones using Vocalised Zebra Mobile on iOS 18+ 
  • No support for Android currently

Q: How do I enable Wi-Fi calling?

A: Please see the following links to enable Wi-Fi calling for your device.


Q: Are there any charges for Wi-Fi Calling?

There are no additional roaming fees for using Wi-Fi Calling. However:

  • Normal call charges apply, Vocalised has one calling plan with separate plan for landlines and mobiles. For example, international calls cost the same calling from a Zebra Mobile service as from the Business Voice Webex apps.
  • Wi-Fi Calling behaves like standard telephony for billing purposes.

Q: what if the Wi-Fi network is congested and there is poor mobile call quality?

Wi-Fi networks don’t guarantee voice quality. You may experience:

  • Dropped calls
  • Delays or poor audio
  • Disruptions when others are using bandwidth-heavy apps (like video streaming)

For the best experience, use Wi-Fi Calling on strong, stable connections with minimal traffic. You can disable Wi-Fi calling if you have poor network quality in your phone's settings.


Q: Can I use Wi-Fi Calling abroad?

Yes, but with limitations:

  • Outbound Wi-Fi calls work abroad, the same as they would in the UK.
  • Emergency calls are only supported within your home country (e.g. the UK for UK-based users).

Q: Can I call emergency services via Wi-Fi Calling in the UK?

Yes, but please note:

  • Your phone will attempt to use a mobile call first for emergency calls, this is the preferred and most reliable method.
  • If only Wi-Fi is available, your phone will attempt to call via Wi-Fi Calling.
  • These calls will be routed to the nearest Public Safety Answering Point (PSAP) based on your device location.
  • You must be prepared to state your location verbally in case GPS or network location fails.

🔔 Emergency VoWiFi is currently only available to UK-based users with UK as their Home Country.

Q: I'm experiencing call issues. What should I do?

A: Confirm Do Not Disturb is off and the number isn’t blocked. If issues persist, contact support and include:

  • Time/date of the call
  • Numbers involved
  • Your device model and location
  • Description of the Issue

Q: How do I report a fault effectively?

A: Please contact support and include the following:

  • Clear description of the issue
  • Type (call, SMS, data)
  • 2–3 examples with time/date and numbers involved
  • Your phone model and location at the time

This info helps us resolve your case quickly and accurately.

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