The GPS signal jammer mainly interferes with the GPS function of mobile phones by emitting electromagnetic wave signals of the same frequency as GPS satellites. Due to the fact that the mobile GPS module relies on receiving signals from satellites to determine its location. The strong signals emitted by GPS signal jammers will submerge or cover up these satellite signals. Causing the phone to be unable to receive and process location data properly.

This interference usually leads to the following impacts:

1. Positioning failure:
The mobile phone is unable to obtain a valid GPS signal, resulting in the failure of the positioning function. Unable to display the current location or provide navigation services.

2. Map services affected:
Map applications and services that rely on GPS positioning will not function properly. Users are unable to view real-time maps, route planning, and other information.

3. Time synchronization issue:
Some mobile phones use GPS signals to calibrate the system time. The presence of jammers may lead to inaccurate display of phone time.

4. Decreased communication quality:
Although GPS signal jammers mainly target the GPS frequency band. But in some cases, the electromagnetic waves it emits may cause a certain degree of interference to adjacent wireless communication frequency bands. Affects the communication quality of mobile phones.

5. Emergency services obstructed:
In emergency situations, such as using a mobile phone to send distress signals, GPS signals may be disrupted and unable to locate in a timely manner, affecting the progress of rescue work.

It is worth noting that the use of GPS signal jammers is legally restricted in many countries and regions. Because it may have serious impacts on public safety, traffic management, and personal legitimate rights and interests. When using GPS signal jammers, it is necessary to weigh their pros and cons and ensure that they are used under legal and compliant conditions.