PayPal Login The most important point of contact is the PayPal website. There are also two mobile apps for iOS and Android. Several online stores have direct integration with PayPal, making it a convenient way to pay and receive money. In addition to the website, you can log in to the PayPal app with your cell phone number. However, you must first activate your phone on the desktop website before you can use it. If you don't know what your user agent is, you can see it on the website.