Does WhatsApp Need a SIM Card?

WhatsApp needs a phone number to register, but not a SIM in the phone afterwards. Once verified, it works over Wi-Fi with no SIM at all.

Registration needs a number

You must receive a 6-digit code by text or call on the number you register. That number can be on a SIM in another phone, an eSIM, a landline that can take the call, or a private number you rent.

After registration

• WhatsApp runs over Wi-Fi or mobile data; the SIM can be removed.
• Tablets and computers can be linked to your account without a SIM.
• WhatsApp asks for a new code when you reinstall or change phones, so keep access to the number.

Using WhatsApp Business with a landline

WhatsApp Business can register a landline: choose the call option to receive the code by voice.

Avoid losing the account

Turn on two-step verification and add an email address in Settings › Account. If you later lose the number, you cannot register the account on a new phone, so keep the number active or move WhatsApp to a number you keep.

Keeping the number alive

Prepaid numbers can be cancelled after a period without use or top-up. If WhatsApp depends on that number, top it up as your carrier requires. A cancelled number can be given to someone else, who could then register WhatsApp on it once your account is inactive.

FAQ

Can WhatsApp work without a SIM card?

Yes, after registration it works over Wi-Fi.

Can I register WhatsApp without any number?

No. You need a number that can receive the code.

Can I use WhatsApp on a tablet without a SIM?

Yes, by linking it to your account as a companion device.

Related: WhatsApp on a new phone · international numbers · eSIM vs physical SIM.