How to install the second SIM- card in Xiaomi Redmi Note 7: a guide with nuances

Xiaomi Redmi Note 7

How to add a second SIM- card

Unlike the flagship models with Dual SIM + microSD support, the Redmi Note 7 has a hybrid slot, which means you have to choose between a second SIM and a memory card. But not everything is so clear: there are life hacks to circumvent restrictions, as well as important points when setting the priority of networks or using operators with different standards (4G/3G). If you plan to use two SIMs for work and personal needs, this guide will help avoid common problems.

Before you start, make sure your Redmi Note 7 supports the right carrier frequencies. For example, if one of the Tele2 or Yota SIMs, check for Bands 3/7/20 compatibility — their smartphone supports, but there may be nuances with network priority. Also prepare a nano-SIM (or micro-SIM adapter) and a tray extraction needle — it comes with the kit.

1. Which slot to choose: second SIM or microSD?

The main feature of the Xiaomi Redmi Note 7 is the SIM2/microSD hybrid slot, which means that you can not use two physical SIM- cards and a memory card at the same time.

• 📱 Two SIM- cards (no microSD) – suitable for those who switch between numbers frequently (e.g. work + personal).
• 💾 One SIM + microSD is optimal if memory is the priority and the second SIM is not needed all the time.
• 🔄 Alternation – Some users carry a second tray with a microSD and change it as needed.

If you choose two SIMs, consider that the second SIM- card does not support 4G if the first one is already using LTE. This is a hardware limitation - the smartphone can not physically connect to two 4G- networks at the same time, in which case the second SIM will only work in 3G/2G mode.

The alternative is to use an eSIM, but the Redmi Note 7 doesn't support it. If both SIMs and memory are critical to you, consider buying a OTG- microSD adapter (connects via USB-C), but this is inconvenient for permanent use.

2. Step-by-step instruction: how to insert a second sim

The process of installing the second SIM- card is simple, but there are a few critical points that are often overlooked.

1. Turn off your smartphone. That's a must-do -- hot SIM swapping can cause the network to crash.
2. Find the tray for the SIM- cards on the left side of the Redmi Note 7 (near the volume button).
3. Put a needle (or paperclip) in the tray hole and press gently until it is pushed out.
4. Place the nano-SIM in the SIM2 slot (top tray SIM1, bottom tray SIM2/microSD). Make sure the bevelled corner of the card matches the pattern on the tray.
5. Put the tray back in before you click. Don't put too much effort in!
6. Turn on the phone and wait for the network to be determined (it can take up to 2 minutes).

If after turning on the smartphone does not see the second SIM:

• 🔄 Reset the device.
• 📶 Check if the option is dual SIM- card enabled in the settings (Settings → SIM- cards and mobile networks).
• 🛠️ Carefully remove the tray and check if the SIM has shifted during installation.

⚠️ Warning: If you use a memory card in a SIM2 slot and then decide to swap it for a SIM, all the data from the microSD will be unavailable until you return it. The smartphone does not save files on the memory card when it is removed!

3 Network Configurement for Two SIM- Cards

Once the second SIM is installed, it needs to be configured correctly to avoid connection problems. The main settings are in the Settings menu → SIM- Cards and mobile networks.

• 📞 Assign names for SIMs (e.g., "Work" and "Personal") so that they don't get confused when calling.
• 🌐 Select network priority for each SIM (4G/3G/2G). Remember: If the first SIM uses 4G, the second SIM automatically switches to 3G.
• 📵 Disable mobile data for one of the SIMs to save battery power.
• 🔄 Set up call forwarding if one of the sims is unavailable.

Pay special attention to the setting of mobile Internet:

1. Go to Settings → SIM-cards and mobile networks → Mobile Internet.
2. Select the SIM that will be used to transfer data by default.
3. If necessary, activate the option to Use Mobile Data during a call (useful for VoLTE).

If you have trouble connecting to 4G on the second SIM, check out:

• Does your carrier support VoLTE (voice over 4G)?
• Is 2G only enabled in the network settings?
• Is the firmware of the smartphone updated (old versions of MIUI had bugs with Dual SIM).

💡

If the second SIM doesn't catch the network, try manually selecting the operator in the settings (Settings → SIM- cards → [select SIM] → Network operators] Sometimes automatic search fails.

Typical problems and their solutions

Even with the right setup of the second SIM, Redmi Note 7 users may face a number of problems, including the most common and ways to fix them:

One of the most frustrating things is when a smartphone sees a second SIM but can't connect to the network, most often it's connected to:

• 📵 Lock IMEI (if the SIM is from another region).
• 🔧 Frequency incompatibility (e.g., a MTS SIM may not catch 4G on Band 20 in some regions).
• 📲 Firmware failure (especially after the MIUI update).

If rebooting and resetting network settings (Settings → Reset → Network Reset) didn’t help, try inserting the SIM into another smartphone – this will help determine if the problem is in the card or in the Redmi Note 7.

⚠️ Warning: If you use two SIMs from the same operator (e.g., both from Beeline), there may be conflicts when incoming calls are made at the same time, and operators sometimes block such schemes to prevent fraud.

5. Alternative Ways: How to Use Two Sims and MicroSD Simultaneously

While the Redmi Note 7 doesn’t support two Sims and a memory card at the same time, there are workarounds:

• 🔌 USB OTG + card reader: Connect the microSD via the adapter to the port USB-C. Minus - occupies the connector and requires constant wear of the adapter.
• ☁️ Cloud storage: Move files to Google Drive, Mi Cloud or Yandex Disk. Suitable if you have a stable Internet connection.
• 📱 Second SIM electronically: Some operators (e.g. MTS) offer the Second SIM service as a virtual number linked to the main one.

The most reliable, but expensive option is to replace the Redmi Note 7 with a model with a full Dual SIM + microSD, for example, the Redmi Note 10 Pro or POCO X3 Pro. However, if the smartphone suits the rest of the parameters, it is easier to optimize the use of the current slot:

Another life hack is to use a large memory SIM (like Tele2 with 100GB of cloud as a gift) and give up microSD altogether, eliminating the need to constantly switch trays.

6.Compatibility with operators: which SIMs work better

Not all carriers work equally well in Dual SIM mode on the Redmi Note 7.

• 📶 MTS and Beeline are best compatible with 4G on the first SIM and 3G on the second.
• 📡 MegaFon – may require manual network selection (only) 3G for the second SIM.
• 🌐 Tele2 and Iota – often only work in 2G on the second sim, if the first uses 4G.
• 🛡️ Virtual carriers (Tinkoff Mobile, SberMobile) may not support VoLTE, which will lead to problems with calls.

If you plan to use different carrier SIMs, check their compatibility in CSFB (Switching from 4G to 3G for calls). For example, if the first SIM1 from MTS with 4G and the second SIM2 from Tele2, calls to the second SIM may be interrupted or not at all.

To verify the quality of communication:

1. Install Network Cell Info Lite (available on Google Play).
2. See what frequency each SIM is operating at.
3. If the signal is weak, try manually selecting 3G only for the second SIM.

💡

On the Redmi Note 7, the second SIM- card does not support 4G if the first card is already connected to LTE. This is a hardware limitation that cannot be circumvented software.

7. Frequent User Errors and How to Avoid Them

Many of the problems with the second SIM on the Redmi Note 7 are due to non-obvious errors.

• 🔄 Hot SIM Replacement: Removing the tray when the phone is on can cause the communication module to crash. Always turn off the smartphone!
• 📱 Using a micro-SIM without an adapter: The slot is designed for nano-SIM. If you insert a micro-SIM without trimming, the contacts will not fit tightly.
• 🔋 Ignoring Updates MIUI: Older versions of the firmware had bugs with Dual SIM that were patched in new releases.
• 📶 Incorrect Network Priority: If the second SIM is configured to 4G but the first one is already using it, the connection will be permanently reset.

Another common mistake is to use SIMs with the same services (for example, both with unlimited Internet), in which case the smartphone may confuse which SIM to use for data, which leads to increased battery consumption.

1. Open Settings → SIM- Maps and mobile networks → Mobile Internet.
2. Select one SIM for data transfer by default.
3. Turn off the mobile internet for the second SIM if you don't need it.

If after all the manipulations, the second SIM still does not work, check it on another phone. If the problem persists, contact the operator to check the activation of the card.

FAQ: Answers to popular questions