Use Dual SIM with Apple Watch GPS + Cellular models
If you set up multiple mobile plans using Dual SIM on your compatible iPhone, you can add both plans to your Apple Watch. Then you can choose which one your watch uses when it connects to mobile networks.
Set up multiple mobile plans
If you set up Dual SIM on your iPhone XS, iPhone XS Max or iPhone XR or later, you can add both mobile plans on your Apple Watch Series 4 or later, as long as each plan is eligible and from a supported network provider.
You can set up one plan when you set up your watch for the first time. Then you can set up your second plan later in the Apple Watch app:
On your iPhone, open the Apple Watch app.
Tap the My Watch tab, then tap Mobile.
Tap Set Up Mobile or Add a New Plan. If you didn’t add your first plan during setup, you can add it here.
Follow the onscreen steps to choose the plans that you want to add to your Apple Watch. Each mobile plan will be billed separately. If you need help, contact your network provider.
You can add up to five mobile plans to your Apple Watch. However, your Apple Watch can only connect to one at a time. If you have an enterprise or corporate mobile data plan, check with your company or network provider to see if they support this feature. Pre-paid accounts and some older accounts aren’t currently supported. To make sure that your account is eligible, contact your network provider.
Switch between plans
On your iPhone, open the Apple Watch app.
Tap the My Watch tab, then tap Mobile.
Your plan should automatically switch. If it doesn’t switch, tap the plan that you want to use. It may take about a minute for your Apple Watch to switch plans.
You can also switch plans directly from your Apple Watch. Go to Settings > Mobile or Settings > Mobile Data, then choose the plan that you want your watch to use when it connects to mobile.
Here’s how your Apple Watch receives calls and messages
When your Apple Watch is connected to your iPhone, you can get calls and messages from both plans. Your watch shows which mobile plan you received a notification from by showing a badge with the first letter of the line. If you respond to a call or message, your watch automatically responds from the line that you received the call or message on.
When your Apple Watch is away from your iPhone and connected to mobile, you can get calls and messages from your active plan. If your iPhone is turned on, even if it isn’t nearby, you can get messages and notifications about calls from your other plan. If you respond to a call, your watch automatically calls back from your active plan. If you respond to an SMS message, your watch automatically texts back from the plan that you received the message on. You can respond to iMessages as long as there’s an active data connection from any plan. If you want to change your active plan, you can manually switch between plans from Settings on your Apple Watch.
