Today a friend is having issues getting into Whatsapp at an iPhone, her phone asked to set a verification code even when her account was already verified for months. Now she only gets "You have guessed the code too many times. Please contact customer support for assistance" and she doens't get a waiting time.
WhatsApp requires an active phone number to create an account. If you’re having issues verifying, please verify the following:
You have the latest version of WhatsApp installed from the App Store.
You have entered your full international phone number, including the country code (or select your country from the country list).
An example of a US phone number is: + 1 408-555-1234.
Omit any leading zeros (0s) or exit codes from your number.
Your phone has full Internet access with a strong signal. Try opening a web page to make sure.
Your phone can receive international SMS messages.
You’re not using an unsupported device such as an iPod touch or iPad.
Your device isn’t jailbroken.
After you enter your phone number, please wait for an SMS to be delivered to your phone. The SMS will contain a 6-digit verification code, which you can enter on the verification screen in WhatsApp. The verification code is unique and changes each time you verify a new phone number or device. Please don’t guess the verification code as you may be locked out for a period of time.
Note: If you have iCloud Keychain enabled and have verified this number before, you may be automatically verified without receiving a new SMS code.