Add-on Numbers

Usage Tips

Use “Add-on Numbers” to get a new numbers so as to use 2 WhatsApp in 1 Phone

1. Get a new mobile number directly through Add-on Numbers App or port-in your current mobile number via SmarTone Store
2. Create a new WhatsApp by using "Parallel Space" App
3. Register the newly created WhatsApp with the number from "Add-on Numbers"

To download “Parallel Space”, please visit

< Free Trial is available now! >

Free Trial is applicable to new customers only*. After the free trial, you can continue using this number by subscribing to the service.

*New customers defines as customers who have not registered for Add-on Number or any kinds of free trial programme for Add-on Number before.


For many reasons, you may need different phone numbers to keep your different lives separate, be it long term or temporarily – even for as short as a day. For the long term, you may wish to have a separate mobile number for your family, another one for your work, and even one for acquaintances.

On the other hand, there may be occasions where you need to keep in touch with others temporarily but are hesitant to give out your main number, for example:
• You are flat hunting or trading your car but do not want to give your main number to someone you hardly know;
• You do not want to give out your main number at parties to someone you have just met etc

With Add-on Numbers, you can add up to 4 local mobile/fixed-line numbers on the same phone. Simply choose new mobile numbers directly from the app to enjoy the service right away, or use your existing mobile/fixed-line numbers. Each add-on number comes with its own:
• Phone dialer, Calling identity, Message folders, Phonebook, Voicemail

This service is available to users of Hong Kong mobile operators.

Downloading this app is free.
Standard Plan: Each add-on number only costs $5 per day, capped at HK$35 per 30 days.
Monthly Plan Contract Offer: Each add-on number only costs $30 per month (12 months contract). It is only applicable to SmarTone’s customers.

# For the non-SmarTone customers, yearly plan is available. An advance payment of HK$368 is charged for each number per year (HK$360 as service fee and HK$8 as MMS and SMS, advance payment).

Service website:

• The charge of Standard Plan is on a recurring basis. A day is defined as 00:00-23:59, Hong Kong time.For the details of Monthly Plan Contract Offer and Yearly Plan, please refer to the Terms & Conditions for this service.
• To use an existing mobile/fixed-line number as an add-on number, please come to SmarTone stores for registration.
• For SmarTone customers: usage of voice, data, messaging, IDD and roaming will be deducted from the main number’s service plan and any additional usage incurred will be charged to the monthly bill accordingly. Calls made by the mobile numbers under this service will incur voice usage and be counted as voice minutes, while calls made by fixed-line numbers under this service require data connection and usage will incur data charges.
• For non-SmarTone customers: a $48 advance payment is required from which service and additional fees will be deducted as applicable. The use of IDD will require registration at SmarTone stores and will be charged accordingly. Voice calls (including the calls made by mobile numbers and fixed-line numbers) and messaging will be delivered by data and usage will incur data charges with the customer’s network provider.
• The fixed-line numbers under this service do not support MMS.
• Data connectivity is required for the service. When using the service which requires data connection, service performance may be affected by the network performance of the customer's network provider.
• This service is available for smartphones running Android 4.4 or above.
• Terms and conditions apply.
• For service details, please visit
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What's New

Enhances app stability
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Additional Information

July 16, 2018
Current Version
Requires Android
4.4 and up
Content Rating
Offered By
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