You can use two SIM cards on Galaxy S9 and S9+ if your phone is the dual-SIM version of Galaxy S9/S9+.
However, the dual-SIM version of Galaxy S9 and S9+ is dual standby only, not dual active. Therefore, you may encounter some limitations when you use two SIM cards in Galaxy S9 and S9+.
This Galaxy S9 guide answers all questions you may have on using two SIM cards on Galaxy S9 and S9+.
Is your Galaxy S9/S9+ capable of using two SIM cards?
Only the dual-SIM version Galaxy S9/S9+ can use two SIM cards. Don’t waste time or money to use two SIM cards if you got a single SIM version of Galaxy S9 or S9+.
If you bought your Galaxy S9 or S9+ in the US, very likely, it is a single SIM phone only. You cannot use two SIM cards on these phones sold in the US (through carriers and official distributors).
In most international markets, your Galaxy S9 or S9+ is very likely a dual-SIM version. And therefore, you may use up to two SIM cards on the phone.
You should always check with the seller on whether you can use two SIM cards on the phone you want to buy.
You can also check the Galaxy S9 box to see whether the Galaxy S9 or S9+ is dual SIM or single SIM version.
In most regions, the dual-SIM capability is usually marked as “duos” on the left side of the official Galaxy S9 box as shown below.
What are the limitations of using two SIM cards on Galaxy S9 and S9+?
The dual-SIM Galaxy S9 and S9+ are dual standby only, not dual active. This means both SIM cards are reachable when in the standby mode.
When you are talking through one SIM card, the other SIM card, by default, will be unreachable unless you enable dual SIM always on.
For the explanation of the differences between dual standby and dual active dual SIM phones, you may check this guide.
The limitations of using two SIM cards on Galaxy S9 and S9+ include:
- When you are talking on one SIM card (through any mobile networks, 2G, 3G or 4G LTE), the other SIM card will be unreachable unless you enable dual SIM always on.
- When you pick up a voice call, the mobile data connection