Compilation of Viettel, Vinaphone, MobiFone eSim Issues

Currently, there are many devices on the market supporting users in using eSim as the primary SIM for calling, texting, FaceTime, accessing 4G networks, and many other convenient features provided by the carriers. However, this has also led to various common eSim issues affecting users and causing discomfort.

List of common eSim issues and troubleshooting methods

I. Understanding eSim

eSim (Embedded SIM) is a type of electronic SIM with a significantly smaller size (approximately 5x5mm) compared to other SIM types. eSim is suitable for small devices or those without space for a larger SIM. Of course, eSim also enhances user experience, offering more convenient features.

For more details: What is eSim

II. Compilation of Common eSim Issues

Many users often encounter eSim issues when using iPhones, where features like iMessage and FaceTime are disabled, rendering users unable to perform certain actions. Some face problems like signal loss or weak signals affecting communication.
- iMessage and FaceTime errors are disabled and cannot be used.

III. Common Fixes for Common eSim Issues

1. Fix Disabled iMessage and FaceTime
Mostly encountered on iOS 15.4 devices, the solution for eSim iMessage and FaceTime being disabled is:
- Upgrade to the latest OS version (if available)
- Contact the carrier for issue resolution or obtain a new eSim.

2. Fix Viettel eSim Signal Loss, Unable to Call, No Service
- Fix Viettel eSim Signal Loss: Possible causes include weak Viettel signal area, using 2 physical sims and eSim simultaneously on one device, or incompatible OS.
+ Update phone OS to a higher version
+ Move to an area with better Viettel signal
+ Restore the device

- Fix Viettel eSim Unable to Call: Possible reasons include not selecting the call sim for eSim, Apple or eSim signal loss.
+ Enable call function for eSIM: Go to Settings => Mobile => set as primary or secondary for the desired sim.
+ Restart the device
+ Update OS
+ Move to an area with Viettel signal

Fixing Viettel eSim Service Issues: Possible reasons include eSim errors, being out of Viettel network coverage, having airplane mode on, or eSim's main sim being deactivated.
+ Turn off airplane mode on your device
+ Move to an area with strong Viettel signal
+ Restart your device
+ Replace eSim with a new one, register the new eSim

Reference: How to Register Viettel eSim

3. Resolving Vinaphone eSim Issues with Incoming Calls and 4G Access
- Fixing Vinaphone eSim Not Receiving Incoming Calls: Possible reasons include two-way sim lock, blocking incoming calls, CS Fallback error, or network system error.
+ Turn off call blocking feature: Go to Settings => Calls => Turn off call rejection.
+ Use only 3G/2G instead of 4G/LTE: Go to Settings => Connections => Sim card manager => Mobile data => enable 3G/2G mode.
+ Contact VinaPhone hotline for assistance with unlocking two-way sim.

- Fixing Vinaphone eSim No 4G Access:
+ Check if mobile data is enabled on your phone
+ Check the remaining data of your 4G package
+ Configure eSim for 4G access
+ Contact the network provider, it might be Vinaphone's network issue

4. Fixing issues with MobiFone eSim: Unable to make calls, not receiving calls, signal loss, and unable to receive messages.
- Fixing MobiFone eSim Unable to Make Calls: Possible reasons include not selecting eSim for calls, being unidirectionally blocked, running out of balance, experiencing signal loss, device issues, or network system errors.
+ Select the calling sim for eSIM
+ Recharge your account, pay the bill
+ Move to an area with MobiFone signal
+ Restart your device
+ Call MobiFone hotline

- Fixing MobiFone eSim Not Receiving Calls: Reasons may include blocking incoming calls, network locking in two directions, activating call forwarding, being outside coverage, or network system errors.
+ Contact the network to unlock two-way calls
+ Turn off call forwarding using the code ##21#CALL
+ Move to an area with stable signal

- Fixing MobiFone eSim Signal Loss: Reasons may include activating airplane mode, not using eSim for a long time, turning off eSim on the phone, weak signal, or network issues
+ Turn off airplane mode on the phone
+ Check phone settings, activate eSim if turned off
+ Contact the network, check if eSim has been revoked due to prolonged inactivity, or
+ Go to a location with a more stable signal

- Fixing MobiFone eSim Not Receiving Messages: Reasons may include eSim being blocked in two directions, blocking messages from that number, or network system errors.
+ Contact the network to unlock two-way communication
+ Remove message blocking with the code REMOVE SB ALL send to 999

These useful insights will help you identify and quickly resolve common eSim issues. However, if you still encounter similar situations, consider obtaining a new eSim or take your phone for inspection, seeking assistance from professional technicians.