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At iService India, we regularly meet users who face a frustrating issue where their phone hangs, slows down, or becomes unresponsive during calls. Sometimes the call connects, but the screen freezes; sometimes the voice breaks, and in some cases, the call drops automatically. This problem can happen in any smartphone, whether it is a budget, mid-range, or even a premium device.
In many situations, users ignore the early signs because the phone works normally in other tasks like browsing, watching videos, or using apps. But during calling, the device suddenly starts behaving differently. This makes it confusing because the problem does not appear all the time, only during specific usage.
There are many reasons why a phone hangs during calls. Most of the time, it is not one single issue but a mix of small problems that affect performance.
1. Too many apps running in the background
Most smartphones keep apps running even when you are not using them. Apps like Facebook, WhatsApp, Instagram, Gmail, and system services continuously use RAM in the background. When a call comes in, or you are already on a call, the phone suddenly needs extra memory to handle the calling screen, audio processing, and network activity. If RAM is already occupied, the phone starts slowing down, the screen may freeze, or the call interface may become unresponsive for a few seconds.
2. Low storage space
When internal storage is almost full, the mobile system does not have enough space to create temporary files required for smooth operation. This affects overall performance, including calling functions. You may notice slow call response, a delay in opening the dialer, or freezing during call switching. Ideally, a phone should always have at least 15–20% free storage for stable performance.
3. Overheating or old hardware
Older mobile or heavily used devices often face a performance drop due to heating or aging components. When the processor gets hot, the phone automatically reduces its speed to prevent damage. This process is called throttling. During calls, this reduced performance can cause lag, delay, or temporary hanging, especially if the phone is already under heavy usage or charging.
4. Network or VoLTE issues
A weak network connection or unstable VoLTE service can also make the mobile lag during calls. Smartphones constantly communicate with nearby towers to maintain stable call quality. If the signal keeps fluctuating or the device repeatedly switches between 4G, 5G, and VoLTE networks, the mobile processor works harder in the background. This extra load may cause temporary hanging, delayed voice transmission, audio lag, or freezing of the call interface.
5. Software Bugs or Outdated Updates
Software-related issues are another common reason behind mobile phones hanging during calls. Sometimes, a recent software update may contain bugs, while in other cases, using outdated software for a long time creates stability issues. Corrupted cache files, system glitches, or app conflicts can directly affect the app and calling functions. As a result, the mobile may freeze while answering calls, switching between calls, or opening the call screen.
6. Faulty App or Third-Party Apps
The app plays a major role in handling incoming or outgoing calls. If its cache becomes corrupted or if third-party apps interfere with calling functions, the phone may start hanging during calls. Apps like memory cleaners, call recorders, or battery boosters sometimes create conflicts with system processes. This can result in delayed call response, screen freezing, or the mobile becoming unresponsive while answering or disconnecting calls.
7. Heating Problems
Overheating affects smartphone performance more than many users realize. During gaming, charging, video recording, or heavy multitasking, the mobile temperature may rise significantly. When the device becomes too hot, the processor automatically slows down to control heat and protect internal components. Because of this reduced performance, users may notice lag during calls, delayed touch response, or freezing while using the mobile.
8. Local touch screen issues
Sometimes a mobile may start hanging, responding slowly, or freezing after a local or low-quality touch screen has been installed. This is commonly seen when the replacement touch is not fully compatible with the device.
If you are facing hanging, touch lag, screen freezing, or unresponsive touch after a screen replacement, visit iService India for a complete device inspection. The problem may be related to the touchscreen, software, display connection, or another hardware component. Proper diagnosis helps identify the actual cause before any repair is recommended.
If your still hangs during calls even after basic fixes like clearing storage, restarting, updating software, or removing apps, then the issue may be more serious and needs proper checking.
At iService India, such cases are diagnosed in detail to find whether the problem is related to software or hardware.
You should visit a service center if:
In such cases, professional diagnosis is the best way to fix the issue permanently.
Phone hanging during calls is usually a sign of performance overload, storage issues, heating, or network instability. In many cases, regular maintenance and proper usage can reduce this problem, but if it continues, it should not be ignored.
At iService India, we always recommend proper diagnosis instead of guessing the issue, so the exact cause can be found and the right solution can be applied.
1. Why does my phone hang only during calls?
Most of the time, it happens due to heavy background apps, heating, low storage, or a weak network signal. During calls, the phone uses extra system resources, so any small performance issue can cause lag.
2. Can SIM card issues cause call-hanging problems?
Yes. A damaged or old SIM card or poor network registration can create instability during calls. In such cases, replacing or reinserting the SIM often helps.
3. Can overheating make the phone hang during calls?
Yes, overheating can directly affect phone performance during calls. When the device temperature increases, the processor automatically reduces its speed to control heat and protect internal components. Because of the performance drop, the mobile may start lagging, responding slowly, or even freezing for a few seconds during calls.
4. Is this issue common in all smartphones?
Yes, it can happen in any smartphone—Android or iPhone—especially if the device is old, overloaded, or not maintained properly.
5. When should I visit a service center?
If your phone still hangs during calls even after all troubleshooting steps, it is better to get it checked. At iService India, technicians can properly diagnose whether the issue is software or hardware-related.