1. Slow Phone
This is something that everyone has experienced at least once. It is the most common telephone problem and can be associated with older telephones. However, newer devices can present the same problem. When your Random Access Memory (RAM) is full of applications and files that you don't use or need, your phone tends to respond slowly.
Clean your phone and close / delete applications, files and wipe the data from the cache memory. If you recently installed an app and your phone isn't working well, you should uninstall it and see if your phone responds faster. If this doesn't help, you can also try saving important information to Google Drive, Dropbox, or your computer. Then you can reset your cell phone to factory data.