Adding family numbers on a B31 smartwatch is usually done through the mobile app connected to the watch. In most cases, you do not type these numbers directly on the smartwatch itself. The app sends the saved contacts to the watch after you press Save.
One thing that can confuse users is that different B31 watches may use different apps or menu names. You might see Family Number, SOS Number, Emergency Contact, or SOS/Family Number instead. The steps are still very similar.
How Do You Add a Family Number to a B31 Smartwatch?
Start by making sure the watch is already connected to its companion app and showing as online. If the watch is offline, the number may save inside the app but fail to reach the smartwatch.
Then follow these steps:
- Open the mobile app connected to your B31 watch.
- Select your watch if the app manages more than one device.
- Open Settings, More, or Device Settings.
- Find Family Number, SOS Number, or Emergency Contacts.
- Tap an empty contact field.
- Enter the family member's name if the app asks for it.
- Type the phone number carefully.
- Tap Save or Confirm.
- Keep the watch connected for a short time so the contact can sync.
After that, check the smartwatch and see whether the number appears in its contact or emergency section.
What Does Family Number Mean on a B31 Watch?
A family number is usually a trusted phone number that the watch can use for emergency calling. Parents, guardians, or close family members are normally added here.
Depending on the B31 version, these numbers may also appear in the normal contact list. Other models keep family numbers and normal contacts in separate menus.
That difference matters because adding someone to the Phone Book does not always make them an SOS contact.
What Should You Check Before Adding Family Numbers?
The B31 watch normally needs an active connection to receive changes from the mobile app. If the device is offline, contact syncing can fail even when everything looks correct on your phone.
Before adding numbers, check that:
- The watch is turned on
- The correct device is connected to the app
- The watch SIM is active if your model uses one
- Mobile data or network service is working
- The watch has a usable signal
- Your phone has internet access
It is also worth opening the app's device page and checking whether the watch status says online.
What Number Format Should You Enter?
Use a clean phone number without unnecessary symbols. Some smartwatch apps do not handle brackets, spaces, or dashes very well.
For example, instead of entering:
+44 (7700) 123-456
use something closer to:
+447700123456
If the local version of the number does not work, try adding the correct country code. The best format can depend on your mobile network and country, so there is no single format that works everywhere.
When testing, keep the number simple first.
How Many Family Numbers Can a B31 Smartwatch Store?
This depends on the exact B31 model and the app it uses. Many GPS smartwatches provide three main SOS contact slots, while some newer models allow a longer family list.
The easiest way to check is inside the app itself. If you see three separate SOS fields, those are probably your main emergency contact slots.
If you see an Add Contact button and a scrollable list, your B31 may support more numbers.
Do not worry if another B31 guide shows a different limit. Several watches are sold under similar B31 names.
How to Add Normal Contacts Instead of SOS Numbers
If you want someone to appear as a normal contact rather than an emergency number, look for Phone Book, Contacts, or Address Book in the companion app.
Open that section and add the person's name and phone number. Save the contact and give the watch a little time to update.
The usual flow looks like this:
App → Settings or More → Phone Book → Add Contact → Save
Normal contacts are useful when the wearer needs to call someone manually. SOS numbers are meant more for emergency calling.
Some B31 watches may combine both lists, but many keep them separate.
How Do You Test a Saved Family Number?
Once the number has synced, test it before relying on it.
If the watch has a Phone Book, open it and check whether the new contact appears. You can also make a normal test call if the watch supports outgoing voice calls.
For SOS contacts, let the family member know before testing the emergency button. Many GPS watches start calling saved SOS numbers after the SOS button is held for a few seconds.
The exact button action may be different on your B31 model, so avoid assuming every version works exactly the same.
A quick test is useful because it confirms both the saved number and the watch's calling connection.
Why Is the Family Number Not Showing on the Watch?
If the number is saved in the app but missing from the smartwatch, the watch may not have received the update yet.
Try these fixes:
- Check whether the watch is online
- Confirm the contact was actually saved
- Make sure the SIM has mobile data
- Check the watch's signal
- Restart the smartwatch
- Close and reopen the companion app
- Remove spaces or symbols from the number
- Delete the contact and add it again
- Make sure you are editing the correct B31 device
A restart is often worth trying after saving new contacts. It can force the watch to reload its latest settings.
If every setting in the app fails to sync, focus on the watch's connection rather than the family number itself.
Why Can the B31 Not Call the Family Number?
If the number appears but the call does not go through, the problem is probably no longer contact syncing.
Check whether the watch SIM supports voice calls and has an active service. Also make sure the watch has enough signal to place a call.
Other possible reasons include:
- Incorrect number format
- No SIM balance or active calling package
- Weak mobile network
- Calling restrictions
- Contact saved in the wrong section
- SIM supports data but not normal voice calls
Try calling another saved contact. If no calls work at all, check the SIM and network first.
If only one family number fails, delete it and add it again using a cleaner number format.
How Do You Change or Remove a Family Number?
Open the same Family Number or SOS menu you used during setup. Tap the saved number and edit it, then press Save again.
If the app provides a delete button, use that to remove the contact. Some apps do not have a separate delete option and instead require you to clear the number field manually.
Keep the watch online after making the change so the new contact list can sync.
It is a good idea to check the watch afterward, especially if you replaced an emergency number.
What If There Is No Family Number Option?
First, look for other names such as:
- SOS Number
- Emergency Contact
- Family Contact
- SOS/Family Number
- Phone Book
- Contacts
- Device Settings
If none of these appear, you may have a different type of B31 smartwatch.
Some B31 devices are GPS watches that are controlled through a parent app. Others are full Android smartwatches that work more like a small smartphone.
A full Android B31 may use a normal Contacts app instead of a Family Number feature. In that case, contacts may be added through the watch itself, a Google account, a SIM card, or Bluetooth.
So if your menus look completely different from a guide, check the watch type before assuming anything is wrong.
How Can You Avoid Family Number Problems Later?
Once the contacts are working, check them whenever an important phone number changes. An old emergency number is much worse than having no extra contact at all because you may think the setup is still correct.
A few simple habits help:
- Keep parent and guardian numbers updated
- Remove unused contacts
- Test SOS after changing a number
- Keep the watch SIM active
- Use simple phone number formatting
- Recheck contacts after major app updates
- Make sure the watch remains connected to the correct account
- Test the calling feature from time to time
You do not need to test the SOS function every day. Just check it occasionally and always tell family members before doing a test call.
Final Thoughts
To add family numbers to a B31 smartwatch, open the companion app, find the Family Number or SOS Number section, enter the contact, and save it. Keep the watch online until the new number has synced, then test the contact to make sure calling works.
If you cannot find the Family Number option at all, your B31 may use a different app or may be an Android-style smartwatch instead of a GPS family watch. In that case, look for normal Contacts or Phone Book settings rather than an SOS family menu.
