The user encounters the error when he tries to enable Wi-Fi calling or when he tries to place a Wi-Fi call (in some cases, the issue started to occur after an OS update). The issue is reported to occur nearly on all versions of Android OS and nearly all the models of Android phones (regardless of the manufacturer). Also, the issue is not limited to a particular carrier. For some users, the problem occurs in another country (works fine in their home country). . Before moving on with the solutions, make sure the developer options of your phone is enabled. Moreover, do not forget to opt-in the project FI by calling their helpline. Additionally, check if your phone model is compatible with Wi-Fi calling.
Solution 1: Force Reboot Your Phone and Reinsert the SIM Card into the Phone
The Wi-Fi calling issue could be a result of temporary communication/software glitch. The issue can be cleared by toggling on/off the Wi-Fi calling option and restarting your device.
Solution 2: Clear the Cache and Data of the Google Fi App
The Google Fi app, like many other applications, uses a cache to boost up performance and improve the user experience. You may encounter the error at hand if the cache/data of the Fi app is corrupt due to unforeseen circumstances like an interrupted update. In this context, clearing the cache and data of the Google Fi app may solve the problem.
Solution 3: Use Airplane Mode of Your Phone
You may fail to use Wi-Fi calling if the signal strength of your phone is low because many carriers have made it mandatory for Wi-Fi calling to work if the signal strength of your phone is not below three bars. In this case, switching to the airplane mode (which will cut out all cellular/radio services) and then enabling just the Wi-Fi may solve the Wi-Fi calling issue.
Solution 4: Dial the Secret Code to Enable WIFI Calling
If you cannot access the WIFI calling options on your phone, then there is a secret code to open a hidden menu that can be used to enable the WIFI calling feature.
Solution 5: Enable Your Wi-Fi Network in the Settings of Wi-Fi Calling
You may fail to make WIFI calling if your Wi-Fi network is not enabled in the settings of Wi-Fi calling. This control is sometimes turned off by default. In this case, enabling your Wi-Fi network in the settings of your Wi-Fi calling may solve the problem. This option may not available for all the users. For illustration, we will discuss the process for a Samsung phone.
Solution 6: Use 2.4 GHz Band to Connect to Your Wi-Fi
Your router usually transmits on two bands: 2.4 GHz (slow but have longer range) and 5 GHz (fast but have the shorter range). Wi-Fi calling has a known history of issues when using the 5GHz band. In this scenario, using the 2.4 GHz band to connect to your Wi-Fi network may solve the problem. For illustration, we will discuss the process for a Netgear router. If you can switch to 2.4 GHz in your phone’s settings, if so, then switch to 2.4 GHz band to check if you can make Wi-Fi calls.
Solution 7: Disable QoS in the Router’s Settings
QoS (Quality of service) manages data traffic to reduce latency/jitter or packet loss by prioritizing specific types of data on the network. You may encounter the error under discussion if QoS is interfering in the normal operation of the Wi-Fi calling. In this scenario, disabling QoS in the router’s settings may solve the problem.
Solution 8: Disable Roaming Services in the Settings of Your Phone
Roaming can be quite helpful in the areas with poor signals but it can hinder the operation of the Wi-Fi calling and thus cause the issue at hand. In this case, disabling Data Roaming – Connect to data services when roaming may solve the problem.
Solution 9: Disable Mac Randomization of Your Phone
Mac randomization is a handy feature to keep your phone safe when connecting to a new Wi-Fi network. However, we saw cases where you may fail to use Wi-Fi calling if MAC randomization of your phone is enabled most probably due to the mechanism of Wi-Fi calling setting specific MAC addresses. In this context, disabling Mac randomization may solve the problem.
Solution 10: Update Carrier Services Application
Google uses the Carrier Services app to enable the latest communication services from mobile carriers (that support enhanced features like Wi-Fi calling). This issue might occur if you are using an outdated Carrier Services app. In this scenario, updating the Carrier Services app to the latest build may solve the problem.
Solution 11: Update the OS of Your Phone to the Latest Build
Google updates Android to patch the known bugs and cater to new features and advancements. You may fail to use Wi-Fi calling if you are using an outdated version of Android. In this context, updating the OS of your phone to the latest build may solve the problem.
Solution 12: Use Hangouts to Make Wi-Fi Calls
Although it is currently not mandatory for Wi-Fi calling to use Hangouts application (which once was). However, if you are not being able to make Wi-Fi calls, then using the Hangouts may solve the problem. If nothing has worked for you, then contact your carrier to check if everything on their end is working properly. Also, check if the following features are enabled for your account: If you can access your carrier settings through a web browser (preferably on a PC), then enable these settings in your account. Also, make sure your E911 address is enabled (especially T-Mobile). If the issue persists, try SIM of another service provider on your phone. Also, check if the issue persists on a different WIFI network (if not, then try a different router on your WIFI network). If you are using an E-SIM in your phone, then switch to a physical SIM and check if the issue is resolved.
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