A simple search of 'account confirmation' or 'new account' are good starting points. This will help you identify which accounts you've previously signed up to. A good starting place is your email address. For the vast majority of online services, you're going to need to visit their websites to get rid of your account. This is where things get a bit more time-consuming. To really decouple yourself from a service, you're going to need to close your account for good. In fact, in the vast majority of cases you'll still be signed up with them. Even though they're gone from your phone, it doesn't necessarily mean that your account with the company behind the software doesn't exist anymore. To delete an app you'll have to remove it from another part of your phone, either through the App Store, or by long-pressing on an app's icon then hitting delete. From here you'll be able to see when you last used and app. In Apple's settings, tap on General and then iPhone Storage. For iPhone users, the process is just as simple.
