A SIM-swap does not hack your phone. It takes over your phone number, and with it every code sent by SMS. Here is what that means for a crypto wallet and which habits reduce the exposure.
Published September 30, 2026 · 2 min read
A SIM-swap happens when an attacker persuades your mobile carrier to move your phone number onto a SIM card they control. From that moment, calls and text messages meant for you reach them instead. The attacker does not need your phone in hand. The real target is the SMS codes that services send to confirm a login or a password reset.
It can only reach what is protected by your phone number. If a service lets someone sign in or recover access with an SMS code alone, whoever holds the number holds that route in. Accounts that do not depend on SMS are much harder to get at this way. Because blockchain transfers are irreversible, nobody can bring back a transfer sent to the wrong address, so it is worth closing the SMS route before it is used rather than after.
The aim is to make your phone number less important than it is today. Each step below removes a place where a captured SMS would be enough.
| Measure | What it addresses | What to keep in mind |
|---|---|---|
| SMS codes only | Nothing against a swap: whoever holds the number receives the code | This is the route a SIM-swap is built to capture |
| App-based or account-based login | Removes the dependence on text messages for signing in | Check that recovery does not quietly fall back to SMS |
| Carrier PIN on the mobile account | Makes it harder to persuade the carrier to move your number | Protects the number, not the accounts that use it |
| Second linked login | Keeps one captured or lost channel from deciding access | Works best when each channel is secured separately |
A single channel is a single point of failure. If it is captured, an attacker may get in; if it is lost or blocked, you may be the one locked out. A second linked login spreads that risk, because one compromised channel is less likely to lock you out or in. Nexus Pay works this way: the wallet opens inside Telegram (bot @nexuspaymybot), and a Google login can be linked as a second way in.
Layers matter more than any single lock. Nexus Pay has an optional four-digit access code in the app, and the main share of crypto funds is kept in wallets without a permanent network connection. The card spends only the available balance, with no credit and no overdraft, and it can be frozen and unfrozen in the app in one tap. None of this replaces protecting your phone number, but it narrows what a single mistake can cost.
Contact your carrier first to regain control of the number. Then review the accounts that rely on SMS for login or recovery and secure them with another method. If you use a card, freeze it in the app until you are sure everything is in order. This is general information, not a guarantee against any attack, so follow your carrier's and each service's own guidance.
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