How to Add a Child to Your Phone Plan

The basic steps for adding a child to your existing plan

Adding a child to your phone plan means contacting your carrier, providing their information, and choosing a device and data allowance. Most carriers let you do this online, by phone, or in a store. The process takes 15 minutes to an hour, and the child's phone is usually active the same day or within 24 hours.

You'll need to decide whether to add them to your existing account (which combines all bills into one) or create a separate account in their name. Most families add children to the parent's account because it keeps billing simple and lets you set spending limits and usage controls from one dashboard.

The cost depends on your carrier and plan. Some plans charge a flat fee per line ($15 to $50 per month, depending on the carrier). Others let you add a line for a reduced rate if you're already paying for multiple lines. A few carriers offer a free or discounted first month.

Key Takeaways

• You can add a line by calling your carrier, visiting their website, or going to a store in person — all three routes take roughly the same amount of time.
• Adding a child to your existing account keeps billing in one place and gives you access to parental controls on most carriers.
• The monthly cost for a new line ranges from $15 to $50 depending on your carrier and whether you're adding a phone or using an existing device.
• You'll need the child's name, date of birth, and Social Security number if you're creating a separate account in their name.
• Most carriers let you set data limits, block certain numbers, and monitor usage from your account dashboard once the line is active.

Adding a line to your existing account versus creating a new account

Adding a child to your existing account is the most common choice. The bill comes to you, you control the spending limits, and you can see usage reports. The child's phone number appears on your bill, and you manage all settings from your account. This works well for children under 18 and is simpler if you're paying for the phone.

Creating a separate account in the child's name is less common but may be necessary if your child is 18 or older, or if you want their account completely separate from yours. This requires their Social Security number and date of birth. They receive their own bill, and you won't have automatic access to their usage or settings unless they give you permission. Some carriers allow you to set up a "family account" that links separate lines so you can still monitor usage and set limits.

Ask your carrier which option makes sense for your situation. If your child is under 13, most carriers require the account to be in the parent's name anyway.

What information and documents you'll need

If you're adding the child to your existing account, you'll need your account number or phone number, the child's full name, and their date of birth. That's usually enough.

If you're creating a new account in the child's name, you'll need their Social Security number, date of birth, and a current address. Some carriers may ask for a photo ID if you're doing this in person, though this is less common for minors.

You'll also need to decide on a device. You can bring a phone you already own, buy a new one from the carrier, or buy one elsewhere and bring it to the carrier to activate. If you're buying from the carrier, they'll show you options and pricing during the signup process.

How to add a line: online, by phone, or in store

Online: Log into your carrier's website or app, look for "Add a line" or "Manage account," and follow the prompts. You'll enter the child's information, choose a device, and select a plan. Most carriers show you the monthly cost before you confirm. The line is usually active within a few hours to 24 hours. You can set up parental controls and usage limits right after the line is created.

By phone: Call your carrier's customer service number (usually on your bill or their website). Tell them you want to add a line for a child. They'll walk you through the same steps as the online process and can answer questions about plan options. This takes 20 to 40 minutes. Ask them to send you a confirmation email with the new phone number and account details.

In store: Visit a carrier store or authorized retailer with your ID and account information. A representative will help you add the line, show you device options, and activate the phone on the spot. This is the fastest route if you want to walk out with an active phone the same day. Bring the child with you if they need a new device, so they can choose one and the store can set it up for them.

Monthly costs and what affects the price

The cost of adding a line depends on your carrier and your current plan. Most carriers charge between $15 and $50 per month for a new line. Some offer discounts if you already have multiple lines on your account. A few carriers include one free line per account or offer a discounted first month.

The price also depends on the data allowance. A line with 2 GB of data costs less than one with unlimited data. Some carriers let you share data from your main plan, which can be cheaper than buying a separate data allowance for the child's line.

Device costs are separate from the monthly line fee. If you buy a new phone from the carrier, you can pay upfront or spread the cost over 24 to 36 months. If you bring a phone you already own, there's no device cost — just the monthly line fee.

Setting up parental controls and usage limits after activation

Once the line is active, most carriers let you set controls from your account dashboard. You can usually set a monthly data limit, block certain numbers or types of calls, restrict app downloads, and see usage reports. Some carriers offer a separate parental control app that gives you more detailed monitoring.

Log into your account online or through the carrier's app. Look for "Parental controls," "Family settings," or "Usage limits." The options vary by carrier, but common settings include data caps (the phone stops using data when the limit is reached), app restrictions, and call/text blocking. You can usually change these settings anytime.

Ask your carrier which controls are included with your plan and which require an extra fee. Some carriers charge $5 to $15 per month for advanced parental control features.

What happens if you want to remove the line later

You can remove a line from your account anytime by calling your carrier, logging into your account online, or visiting a store. There's usually no penalty for removing a line mid-month, though you may be charged for the full month depending on when you remove it. Ask your carrier about their specific policy.

If the child has a separate account, they can keep the phone number and service if they want to pay for it themselves, or you can close the account entirely. Closing an account usually takes effect within 24 hours.

If the phone was purchased through the carrier on a payment plan, removing the line doesn't automatically cancel the device payments. You'll need to pay off the remaining balance or return the phone to the carrier to stop the charges.

Frequently Asked Questions

Can I add a child to my plan if they don't have a Social Security number?

If you're adding them to your existing account, you typically don't need their Social Security number — just their name and date of birth. If you're creating a separate account in their name, most carriers require a Social Security number. Contact your carrier to ask about exceptions or alternative identification.

What if I want to add a line but keep the child's phone number private from me?

If the child is under 18, most carriers require the account to be in the parent's name, which means you'll see the phone number and billing information. If the child is 18 or older, you can create a separate account in their name and you won't have access to their details unless they share them with you.

Can I add a line without buying a new phone?

Yes. You can bring a phone you already own, and the carrier will activate it on the new line. The phone must be compatible with the carrier's network. Ask the carrier whether the phone is compatible before you add the line.

How long does it take for the new line to be active?

Most carriers activate a new line within a few hours to 24 hours. If you add the line in a store, the phone is usually active the same day. If you add it online, it may take up to 24 hours. Call your carrier if the line isn't active within that timeframe.

Will adding a child to my plan increase my bill right away?

Yes, the new line fee will be added to your next bill. Some carriers charge a prorated amount if you add the line mid-month. Check your bill a few days after adding the line to confirm the charge is correct.