# Overview of Lines An active Verizon account has at least one connected line of service. A line of service, or a simply a line, is like a "slot. " Every line on a Verizon account must have the following set up for it to exist: * A phone number (Mobile Directory Number). * An IMEI (International Mobile Equipment Identity). * An ICCID (Integrated Circuit Card Identifier). * A plan. [[Features and Plans|(1)]] A line can optionally have the following: * Additional features. * One DPA (Device Payment Agreement). There are limits to the number of lines you can have depending on the type of Verizon account you have. For each account type, the limits are: * Consumer. * 12 phone lines. * 20 connected device lines. * 30 lines in total. * Business with iSign: * 15 lines in total. # Phone Number [(1)](https://m2mdeveloper.verizon.com/docs/ts-docs-wns/src/WNS.html?var1=https://m2mdeveloper.verizon.com/docs/ts-docs-wns/src/Working/About-Device-IDs.html) This often referred to as an MDN, or a Mobile Directory Number. An MDN can only exist on one account at a time. No matter what kind of device is activated on a line, even if it's a tablet or a Verizon Internet Gateway which can't even make phone calls, the line itself must have a phone number assigned to it due to the way the cellular network operates. # IMEI (International Mobile Equipment Identity) An IMEI is a globally unique identifier for a modem in a 4G/5G device. It being "globally unique" means that no two devices on the planet are supposed to have the same IMEI. # ICCID (Integrated Circuit Identifier) An ICCID is one of the globally unique identifiers for a physical SIM card. # DPA (Device Payment Agreement) A DPA is a 36-month installment you sign up for whenever you buy a new device through Verizon. # FAQ ## Why does Verizon need both the IMEI and the ICCID? If the IMEI and the ICCID are both globally unique identifiers, wouldn't using just one of them for a line be enough? I believe some other carriers are able to activate devices with just an ICCID. It may be technically feasible for Verizon to do the same, but Verizon utilizes both identifiers for different purposes. Verizon uses IMEIs for: * Ensuring a device isn't active on more than one line - This would be a situation where the same IMEI is attempting to be activated on more than two lines at the same time. This would cause problems for obvious reasons. * Checking and reporting devices as lost or stolen - Verizon checks if every device being activated has been reported as lost or stolen by checking the IMEI against a database. They have an internal "negative file" as well as a database that is shared with other carriers like AT&T and T-Mobile. Yes, if a device is marked as lost or stolen on AT&T or T-Mobile, you can't activate it on Verizon. * Correctly provisioning features - The IMEI tells you what type of device is being activated, whether it be an iPhone, Android phone, a tablet, a watch, etc. * Enabling over-the-air programming of eSIMs - Verizon's default activation procedure is to provision an eSIM for any device that supports it. Due to the way tha