There are a number of apps on the market that claim to detect whether or not your phone has been tapped. However, it's important to note that these apps are not foolproof and may not provide reliable results.
In general, detecting phone tapping requires sophisticated hardware and software tools that are typically only available to law enforcement or intelligence agencies. Additionally, even if a tap was in place, it may not be detectable by an app due to the sophisticated techniques used by attackers to remain undetected.
If you suspect that your phone may be tapped, it's best to contact a qualified professional or government agency for assistance. They will have the necessary expertise and tools to conduct a thorough investigation and determine whether or not your phone has been compromised.