You can keep a Chinese phone number and a US phone number active on the same device, as long as your phone supports dual SIM, is carrier-unlocked, and works with both mobile services. Each number can receive calls and texts, and you can choose which line to use for outgoing calls, messages, and mobile data. Whether you can use two physical SIM cards or need a physical SIM and an eSIM depends on your phone model and where it was sold.
Dual SIM vs. Using One US Number in Two Countries
Dual SIM means keeping two separate phone numbers active on the same device. If you study in the US, you might use your Chinese number to contact family and receive messages from accounts in China, while using a US number for school and friends. Keeping a single US number active when you travel to China is a different arrangement. For that option, see one US phone number in the US and China.
Here, a Chinese number means a real mobile line from a Chinese carrier, not a virtual Chinese number. Panda Mobile provides only the U.S. mobile number in this setup. Most Chinese banks and apps do not accept virtual numbers for verification, so keep the Chinese number linked to those accounts.
With two active numbers, decide which line to use for outgoing calls, which number sends your texts, and which SIM provides mobile data. Incoming calls reach whichever number the caller dials. If your bank is linked to your Chinese number, for example, confirm that it can receive verification texts in the US. Switching mobile data to your US SIM does not change where those texts arrive.
Check Which Dual SIM Combination Your Phone Supports
Two Physical SIMs, Physical SIM Plus eSIM, or Two eSIMs
If your phone has two physical SIM slots, you can insert one Chinese SIM and one US SIM. If it has one physical slot and supports eSIM, you may be able to combine a physical SIM with an eSIM. Some phones can keep two eSIMs active at once. Just remember that being able to store several eSIM profiles does not necessarily mean the phone can use several simultaneously. If you are considering an eSIM for your US number, read how to get and activate a US eSIM.
Dual SIM Support Varies by Where Your Phone Was Sold
Dual SIM support depends on where your phone was sold. Certain iPhone models sold in mainland China, Hong Kong, and Macao accept two physical SIM cards, while some U.S. models have no physical SIM slot. Some newer iPhones sold in mainland China also support eSIM, but eSIM profiles from non-mainland carriers cannot be installed while you are physically in mainland China. If you are traveling from China to the U.S. and plan to use a Panda Mobile eSIM, install and activate it after you have left mainland China, such as once you arrive in the U.S. Before choosing a SIM, check your exact model and review Apple’s dual SIM compatibility guide and eSIM guidance for mainland China.
Compatibility Checklist Before Buying a Second SIM
- Phone model: On iPhone, open Settings → General → About. On Android, go to Settings → About phone to find the exact model.
- Physical SIM slots: Check how many physical SIMs your phone can hold. A phone with one slot cannot take two physical cards at once.
- eSIM support: Look for Add eSIM in Settings. Even if your device shows an EID, confirm it supports the US eSIM you plan to buy.
- Carrier lock: On iPhone, look under Settings → General → About → Carrier Lock. “No SIM restrictions” usually indicates an unlocked phone. On Android, check with the original carrier.
- Carrier service: Confirm that both lines work on your device, whether calls, texts, and data will work overseas, and what each carrier charges.
Set Up Chinese and U.S. SIMs on an iPhone
Add Both SIMs and Label the Lines
Insert your physical SIM card or cards first. If your second line is an eSIM and your phone supports it, open Settings → Cellular → Add eSIM and follow your carrier’s instructions. After setup, return to Cellular, make sure both lines are switched on, and label them “China Number” and “US Number.” The exact menu names may vary slightly by iOS version.
Set the Default Line for Calls and Mobile Data
Under Default Voice Line, choose the number you normally want to call from. Under Cellular Data, choose the SIM to use for internet access. For example, while you are in the US, you can use your US SIM for data and leave your Chinese SIM enabled for incoming texts. If Allow Cellular Data Switching is on, your iPhone may switch to the other line for data during certain calls. This could incur roaming charges if that line uses paid roaming, so consider leaving the option off until you know both plans’ rates.
Check Which Number You Are Calling or Texting From
Before placing a call, check whether the dialer shows your Chinese or US line, and switch if needed. You can also choose the sending number when starting a new text conversation. An older message thread may keep using the number previously selected; if you cannot change it, start a new conversation. Incoming texts still arrive at the number they were sent to, regardless of which SIM you use for mobile data.
Set Up Dual SIM on Android
Enable Both SIMs: Google Pixel Example
On a Google Pixel, open Settings → Network & internet → SIMs. Follow the prompts to add a second SIM or eSIM and confirm that both lines are enabled. Samsung, Xiaomi, and other Android phones may use different menu labels; try searching for “SIM” in Settings. You can also follow Google’s instructions for using dual SIM on a Pixel phone.
Set Your Preferred SIM for Data, Calls, and Texts
In SIM settings, choose which line to use for mobile data, outgoing calls, and text messages. If you often call from both numbers, select Ask every time for calls so you can choose a line when dialing. For texts, set your most frequently used number as the default and check the sending line before each message.
Manage Your SIMs When Traveling Between the U.S. and China
Before Traveling in Either Direction
Whether you’re flying from the U.S. to China or from China to the U.S., check that both lines are active and supported at your destination. Before entering China, confirm what calls, texts, and data your U.S. line can use there; if you have Panda Mobile Unlimited or Unlimited Plus, review the applicable OnePool™ China data benefits. Before entering the U.S., confirm that your Chinese number can still receive any verification texts you need. If Wi-Fi Calling is available on your device and plan, set it up before you travel.
After Arriving in the U.S. or China
Once you arrive in either country, open your dual-SIM settings and select a line with data available there. In the U.S., you may use your Panda Mobile U.S. line for data; in China, you can choose your Chinese SIM or, on an eligible Panda Mobile plan, your OnePool™ China data. Check the roaming and usage terms for both lines, then test calls and texts using the numbers you need. Changing the data line does not change which number receives verification messages.
Frequent U.S.–China trips: Panda Mobile OnePool™ lets eligible Unlimited and Unlimited Plus users keep one U.S. number and use included data in both countries. China-specific data allowances and plan terms apply, but you may not need to switch to a separate travel SIM each time.
Dual SIM Checklist for the U.S. and China
|
When you are in the US |
When you are in China |
|---|---|
|
Mobile data: Confirm your U.S. SIM has data and select it as the data line. |
Mobile data: Choose a SIM with data available in China and set it as the data line. |
|
Calls: Use your U.S. number for school or work. |
Calls: Use your Chinese number for local contacts; switch for U.S. calls. |
|
Verification texts: Check that your Chinese SIM gets codes in the U.S. |
Verification texts: Check that your U.S. SIM gets codes in China. |
Everyday Checks for Data, Calls, and Texts
Choose the Line Used for Mobile Data
Most dual-SIM phones use one SIM for mobile data at a time, while the other can remain available for calls and texts. In Cellular Data or Mobile Data settings, select the line that has an available data allowance in the country you’re visiting.
Check the Sending Number Before Calling or Texting
Your phone may remember the line last used for a contact, even after you change the default. Check the number shown in the dialer or message thread before calling or sending a text. If necessary, switch lines or start a new conversation.
If One Line Cannot Connect
If a line shows No Service, check that it is enabled and that its plan is active in your location. If you use a Panda Mobile line, our support team can help review its account status. For device settings, see essential mobile settings and Wi-Fi Calling.
Choose a U.S. Plan That Fits Your Dual SIM Setup
Once you know which SIM format your phone needs, compare how each US plan works in the places you visit. If you mainly live in the US, focus on domestic calls, texts, and mobile data. If you often return to China, confirm whether your US number can receive texts and use mobile data there, along with any additional charges. The 2026 US SIM card guide covers the checks to make before buying.
Add a U.S. Number With Panda Mobile
If you already have a Chinese phone number and want a US line as well, Panda Mobile offers both physical SIM cards and eSIMs. If you mainly study or work in the US, you can consider the Starter plan based on your everyday data needs. If you travel between the US and China regularly, compare the Unlimited and Unlimited Plus plans. Both support OnePool™ shared US–China data, allowing eligible mobile data use in China under the applicable plan terms. Check the specific data allowances and conditions before choosing.
If you need a Chinese number for Chinese banks, apps, or local contacts, keep that real Chinese SIM active alongside your Panda Mobile line. If you do not need a separate Chinese number, a single eligible Panda Mobile U.S. line with OnePool™ may cover your regular U.S.–China travel needs, without managing two active phone numbers.
Panda Mobile plan overview. Check the current plan details and allowances before choosing.
For a first-time Panda Mobile eSIM setup, complete installation and activation after you are outside mainland China—for example, when you arrive in the U.S. A Panda Mobile eSIM cannot be installed and activated for the first time while you are physically in mainland China.
Frequently Asked Questions
Can I Answer a Call on My Second SIM While Already on a Call?
Not always. If you use a Panda Mobile U.S. line alongside a Chinese SIM, both numbers can usually receive calls while your phone is on standby. Whether an incoming call reaches the second line during another call depends on your phone’s dual-SIM features and the two carriers’ support.
Will Leaving My Chinese SIM and Panda Mobile SIM On Cause Roaming Charges?
Keeping both lines enabled does not, by itself, trigger roaming fees. Your Chinese carrier may charge for calls, texts, or data used abroad. Panda Mobile Unlimited and Unlimited Plus include eligible China data through OnePool™, subject to the applicable allowances and terms, please check what is included on official website before using either line overseas.
