# #686# on T-Mobile: Show Your Own Number URL: https://byshahid.com/blog/t-mobile-show-your-own-number-hash-686-iphone/ App: Secret Codes: IMEI & Carrier (https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322) Author: Muhammad Shahid Updated: 2026-11-04 > #686#: #NUM# — read back the number on this line. 686 spells NUM. T-Mobile replies with the mobile number assigned to the line you are dialling from. Genuinely useful on a second line or a fresh eSIM whose number you have not memorised yet. Settings › Phone › My Number shows the same thing. - **Code:** #686# - **What it does:** #NUM# — read back the number on this line. - **Published for:** T-Mobile - **Type:** Carrier specific #NUM# — read back the number on this line. This page explains what `#686#` does, how to use it on an iPhone and which carriers it applies to. I build **Secret Codes: IMEI & Carrier**, a free iPhone app with 317 checked codes and guides, including this one. If you would rather tap than memorise, [get Secret Codes on the App Store](https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322). ## What does #686# do? 686 spells NUM. T-Mobile replies with the mobile number assigned to the line you are dialling from. Genuinely useful on a second line or a fresh eSIM whose number you have not memorised yet. Settings › Phone › My Number shows the same thing. ## How do I use #686#? - Open the Phone app and tap Keypad. - Type #686# 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 lines. | _Screenshot: The Secret Codes detail screen shows the steps, the carriers and an Open in Phone button._ ## Related verizon, at&t and t-mobile codes - [#932#: Check Data Usage](/blog/t-mobile-check-data-usage-hash-932-iphone/) - [T-Mobile Wi-Fi Calling](/blog/t-mobile-wi-fi-calling-iphone/) - [#646#: Check Minutes Used](/blog/t-mobile-check-minutes-used-hash-646-iphone/) - [*86: UScellular Voicemail Access](/blog/uscellular-voicemail-access-star-86-iphone/) - [#225#: Check Your Balance](/blog/t-mobile-check-your-balance-hash-225-iphone/) - [Manage Your UScellular Account](/blog/manage-your-uscellular-account-iphone/) See all [verizon, at&t and t-mobile codes](/blog/iphone-codes/carrier-codes/) or [every category of iPhone codes](/blog/iphone-codes/). ## How Secret Codes helps Secret Codes keeps this and every other entry a search away. Pick your carrier once and each entry says whether it is published for your line. You can save favourites, add a private note, and record whether a code worked on your line. **Secret Codes: IMEI & Carrier** is free on the App Store: https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322 ## FAQ ### What does #686# do on iPhone? #NUM# — read back the number on this line. 686 spells NUM. T-Mobile replies with the mobile number assigned to the line you are dialling from. Genuinely useful on a second line or a fresh eSIM whose number you have not memorised yet. ### What else should I know about #686#? Settings › Phone › My Number shows the same thing. ### What are the steps for #686#? 1. Open the Phone app and tap Keypad. 2. Type #686# exactly as written. 3. Press the green Call button and wait for the result. ### Where do I use #686#? On the keypad of the Phone app. ### Do I need to press Call after typing #686#? Yes. Type it on the Phone keypad, then press the green Call button. ### Is #686# 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 #686# work on? It is published for T-Mobile. T-Mobile lines. ### Does #686# 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 #686# 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 #686# 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 #686#? #932#: Check Data Usage. #WEB# — how much data you have used. ### What else is in this category? T-Mobile Wi-Fi Calling. T-Mobile leans on Wi-Fi Calling more than most. ## Sources - [Verizon Support](https://www.verizon.com/support/)