If you want to spy on someone's phone without their knowledge, you should consider using one of the best spy apps for android. These apps will help you monitor all of their activities, from phone calls to social networking. They will also let you block any number that they use. They can also track their location, and they will let you monitor all their incoming and outgoing emails.
The millennial generation has become very tech-savvy, and they know how to use their cell phones. However, this generation also tends to explore the features of their phones, which can be dangerous. The best spy apps for Android can monitor their activities online and monitor their location. There are many types of Android spy apps, so you can choose the one that best suits your needs.
Employers can also use these apps to keep tabs on their employees. Some companies have trade secrets that they need to protect, and they want to know if their employees are leaking them. Android spy apps are designed to detect employee leaks of these secrets. They can read email, chat, and any other external communications. Most spy apps also include a lot of tracking features, like location tracking, online activities, and even instant messages.
Some of the best spy apps for Android are free or cost a few dollars. Spyzie, for example, has a free version that gives you access to all of the features of the paid version. You can even sign up for the trial version to see if the spy software works before you decide to purchase it.

Useful Resources:
Track iPhone by Number
How to Hack Instagram Account
Spy apps