How Supercell ID verification works
Supercell ID links your game progress to an account instead of a single phone or tablet. When you register, you enter an email address and Supercell sends a short verification code to it. You type the code into the game, and the ID is created or logged in.
When you later log in on another device, the same thing happens: a fresh code goes to the email on your Supercell ID. There is generally no password to remember, which makes that email inbox the real key to your progress.
Supercell can change how sign-in works in different regions or games. If your screen shows a phone number field instead of an email field, read it carefully: a phone used there may also be how you log in later.
Supercell verification code not arriving
Check spam and promotions, and search your inbox for messages from Supercell. Make sure the email you typed is exactly right, since a typo sends the code to someone else's inbox or nowhere. Codes expire, so use the newest one.
If you are logging in to an existing Supercell ID, the code goes to the address you first registered with, which may be an old email you rarely check. If you no longer have access to it, contact Supercell support from inside the game rather than creating a new ID.
Resending again and again can trigger a short wait. Give each code a few minutes before asking for another.
Do you need a number for Supercell?
Usually not for Supercell ID itself. The number people are asked for is often a different one: the phone on an app store account, a payment method, or another service linked to the game. Look at which screen is asking before you buy anything.
If a phone number really is required, treat it the way you would treat the email: it must stay yours. A number that disappears takes your way of logging in with it.
If your goal is simply privacy, an email address you control but use only for games is often enough to keep your main inbox and personal number out of it.
Choosing a number when Supercell asks for one
For a number that will stay connected to your games, rent a private non-VoIP number from $4.99. It is dedicated to you, with unlimited SMS and an inbox only you can read, for 1 day up to 12 months depending on the country. Pick a long period and renew it.
For a single code that will never be needed again, a private per-code number from $0.50 on the /otp page can work. You see the price and stock before paying, and the order is refunded automatically if no code arrives. Start with VoIP High Quality (US, +1), the cheapest pool.
Free shared numbers have a public inbox. Anyone could read a code meant for you, so keep them away from anything that logs in to your games.
Keeping your Supercell progress safe
Connect each game you care about to the same Supercell ID, and confirm the link in each game's settings. Write down which email address the ID uses, so you know where codes will go years from now.
Never share a Supercell verification code with anyone, including people offering gems, trades or help with your account. Anyone with the code can log in to your Supercell ID on their own device.
If you plan to close the email account your ID depends on, sort that out first, with Supercell support if needed. Losing the inbox can mean losing the easy way back in.