Truecaller is one of the best and popular Android apps for blocking spam calls. It has been downloaded more 100 million times. You can use it to block spam calls as well as search for the caller identity of any number. It is an awesome app to download.
The unique thing about Mr. Number is that it has a list of spam numbers it automatically blocks. You can add subsequent spam numbers yourself. It is quite reliable.
Some telemarketers are very smart that they keep changing numbers. Regardless, there is a feature you can use to identify them. It could be the numbers that start or ends the numbers. You can specify these numbers to add them to your blacklists numbers.
It is free, and easy for anyone to use. It can be used to block unsolicited calls and text messages that may be disturbing your mobile phone.
This is a perfect nomenclature for blocking any nuisance calls. The apps allow you to block spam calls, messages as well as block unknown callers as the click of a button.