AT&T's line addition fee and monthly cost
AT&T charges a one-time activation fee of $30 when you add a new line to an existing account. After that, the monthly cost depends on which plan you choose — AT&T offers several options ranging from around $25 to $65 per month for a single line, though the exact price varies based on whether you bundle it with existing lines and which plan tier you select.
The activation fee applies whether you bring your own phone or buy one from AT&T. If you buy a phone at the same time, you may also pay the device cost upfront or spread it across monthly installments through AT&T's payment plan.
Your total bill will increase by the monthly line cost plus any device payments, if applicable. Some promotions occasionally waive or reduce the activation fee, so it's worth checking AT&T's current offers before you add the line.
Key Takeaways
- AT&T charges a $30 activation fee to add a new line, regardless of whether you bring a phone or buy one from them.
- Monthly line costs range from roughly $25 to $65 depending on your plan choice and how many lines you already have.
- If you purchase a phone, you pay the device cost separately — either upfront or split into monthly installments.
- Promotional offers sometimes reduce or remove the activation fee, so check AT&T's website or visit a store for current deals.
How AT&T's plan tiers affect line pricing
AT&T offers several plan levels, and the cost per line changes based on which one you choose. Their basic plans start lower but offer less data, while higher tiers include more data and sometimes additional perks like streaming services or international features.
When you add a line to an existing account, the new line typically costs less than if you started a brand-new account with just one line. For example, a second line on a family plan might cost $25 to $35 per month, while a single-line plan costs more per line. The exact savings depend on which plan you're on and how many lines you already have.
You can view AT&T's current plan options and pricing on their website or by calling 611 from an AT&T phone, visiting an AT&T store, or contacting their customer service at 1-800-331-0500.
Device costs when adding a new line
If you already own a phone and want to use it on the new line, you pay nothing extra for the device — you only pay the $30 activation fee and the monthly line cost. This works if your phone is unlocked or already compatible with AT&T's network.
If you buy a phone from AT&T, the cost depends on the model. Recent flagship phones typically cost $800 to $1,200, but AT&T offers payment plans that spread the cost over 24 or 36 months. You pay a portion each month along with your line charges, so the total monthly bill includes both the line cost and the device payment.
AT&T sometimes offers discounts on phones when you add a line, especially during promotions or when you switch from another carrier. Check their current device deals before you purchase.
What happens to your bill when you add a line
Your AT&T bill will show the new line as a separate item. You'll see the monthly service charge for that line, any device payment if you're financing a phone, and the $30 activation fee on the first bill only.
If you're on a family plan with multiple lines, adding one more line usually costs less per line than a single-line plan would. However, some family plans have a cap on how many lines you can add, so check your plan details or contact AT&T if you're adding more than a few lines.
Your bill may also change if you upgrade your plan tier to accommodate the new line. For instance, if your current plan has a data limit that won't cover two phones, you might need to move to a higher tier, which increases the cost for all lines on your account.
Adding a line online, in-store, or by phone
You can add a line through AT&T's website, at an AT&T store, or by calling customer service. The $30 activation fee applies no matter which method you choose.
Adding online is often the fastest option — you can complete the process in minutes and choose your plan and phone (if buying one) without waiting. In-store, an AT&T representative can help you pick a plan and phone, and you can walk out with a working line the same day. By phone, you can speak with someone directly, though the process takes longer.
Whichever method you use, have your account number and a valid ID ready. If you're bringing your own phone, have the phone's IMEI number available — you can find it by dialing *#06# on the phone or checking the settings menu.
Bringing your own phone versus buying from AT&T
Bringing your own phone saves you the device cost but requires that the phone work on AT&T's network. Most modern phones from major carriers are compatible, but older phones or those from some international carriers may not work. You can check compatibility on AT&T's website by entering your phone's model number.
Buying from AT&T means you get a phone that's may provide to work on their network, and you can finance it over time. The downside is the upfront cost or the added monthly payment. AT&T also locks some phones to their network for a period, meaning you can't use them on another carrier until the lock is removed — usually after you've paid off the device or met other conditions.
If you're switching from another carrier and want to keep your current phone, contact that carrier first to make sure it's unlocked. Then bring it to AT&T or add it to your account online.
Promotions and ways to reduce the cost
AT&T regularly runs promotions that can lower the cost of adding a line. These might include waiving the $30 activation fee, offering a discount on a new phone, or providing a credit toward your first month of service. Promotions change frequently and often depend on which plan you choose or whether you're switching from another carrier.
Military members, first responders, and students may may have access to for discounts on their monthly service. AT&T also offers discounts for bundling services — for example, combining wireless with home internet or TV service can lower your overall bill.
Before you add a line, check AT&T's promotions page on their website or ask in-store whether any current offers apply to you. Some deals are only available online or only in stores, so it's worth checking both.
Frequently Asked Questions
Can I add a line without a contract?
Yes. AT&T no longer requires contracts for adding lines. You can add a line month-to-month and cancel anytime, though if you're financing a phone, you'll still owe the remaining balance on that device if you leave.
Do I have to pay the $30 activation fee if I'm switching from another carrier?
Yes, the $30 activation fee applies whether you're a new AT&T customer or already have an account. Some promotions occasionally waive it for switchers, so check current offers before you add the line.
What if I want to add a line but keep my current phone number?
You can't keep your current number on a new line — each line has its own number. However, you can port your existing number to AT&T if you're switching from another carrier. If you want to keep your old number and add a new one, you'd need to port the old number first, then add a fresh line.
Is there a limit to how many lines I can add to my account?
Most AT&T family plans allow up to 10 lines per account, though some older plans may have different limits. Check your plan details or contact AT&T at 1-800-331-0500 to confirm the limit on your specific account.
Do I need to visit a store to add a line, or can I do it entirely online?
You can add a line entirely online through AT&T's website if you're bringing your own phone or buying one online. If you want to see phones in person or prefer speaking with someone, you can visit a store or call customer service instead.