Secret Codes guide
#999# on iPhone: T-Mobile Prepaid Account Balance
By Muhammad Shahid · · 3 min read
Quick answer
#999#: The prepaid balance code, distinct from postpaid #BAL#. T-Mobile lists #999# under prepaid specifically, where it returns the account balance. On the prepaid side #BAL# reports the service cycle rather than money, so #999# is the one that answers how much credit is left.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Code | #999# |
|---|---|
| What it does | The prepaid balance code, distinct from postpaid #BAL#. |
| Published for | T-Mobile |
| Type | Carrier specific |
The prepaid balance code, distinct from postpaid #BAL#. This page explains what #999# does, how to use it on an iPhone and which carriers it applies to.
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What does #999# do?
T-Mobile lists #999# under prepaid specifically, where it returns the account balance. On the prepaid side #BAL# reports the service cycle rather than money, so #999# is the one that answers how much credit is left.
Pair it with #WEB# (#932#) which returns data used, the data plan and the expiration date, and you have the whole picture for a prepaid line in two calls.
Both answer with a free text and neither consumes credit.
How do I use #999#?
- Open the Phone app and tap Keypad.
- Type #999# exactly as written.
- Press the green Call button and wait for the result.
Which carriers does this apply to?
| Published for | T-Mobile |
|---|---|
| Type | Carrier specific |
| Good to know | T-Mobile prepaid lines. Postpaid accounts should use #BAL# (#225#) instead. |
Related more carrier and n11 codes
- #2535#: T-Mobile Bill Ready Notification
- #664#: Turn On T-Mobile Scam ID
- #763#: Turn Off T-Mobile International Data Roaming
- #634#: Turn Off T-Mobile Scam ID
- #766#: Turn On T-Mobile International Data Roaming
- #436#: T-Mobile Inbound Caller ID Name
See all more carrier and n11 codes or every category of iPhone codes.
How Secret Codes helps
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Frequently asked questions
What does #999# do on iPhone?
The prepaid balance code, distinct from postpaid #BAL#. T-Mobile lists #999# under prepaid specifically, where it returns the account balance. On the prepaid side #BAL# reports the service cycle rather than money, so #999# is the one that answers how much credit is left.
What else should I know about #999#?
Pair it with #WEB# (#932#) which returns data used, the data plan and the expiration date, and you have the whole picture for a prepaid line in two calls. Both answer with a free text and neither consumes credit.
What are the steps for #999#?
1. Open the Phone app and tap Keypad. 2. Type #999# exactly as written. 3. Press the green Call button and wait for the result.
Where do I use #999#?
On the keypad of the Phone app.
Do I need to press Call after typing #999#?
Yes. Type it on the Phone keypad, then press the green Call button.
Is #999# a hidden or secret code?
No. It is a published service, not a hidden menu. iPhones do not have Android-style engineering menus.
Which carriers does #999# work on?
It is published for T-Mobile. T-Mobile prepaid lines. Postpaid accounts should use #BAL# (#225#) instead.
Does #999# work on Android phones too?
It is handled by the carrier or service rather than the iPhone, so it is not tied to one phone brand. Check with your carrier.
Will #999# work outside the US?
It is published for US carriers and services, so do not count on it abroad. Ask your carrier before you travel.
What if #999# does not work on my iPhone?
Check that it applies to your carrier first, because carriers decide which services they offer and can change them. If it should apply to your line, contact your carrier.
What is related to #999#?
#2535#: T-Mobile Bill Ready Notification. Ask T-Mobile to text you when your bill is ready.
What else is in this category?
#664#: Turn On T-Mobile Scam ID. #ONI# — label suspected scam calls without blocking them.
Sources
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