Originally Posted by Scorpius

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NITDroid alternative registration method:

1.- Install NITDroid and Official Android Whatsapp client in it.
2.- Register your N900 phone number with Whatsapp. Complete the registration up to the end.
3.- Go back to Maemo
4.- Install Yappari 0.0.18 if you haven't installed it already.
5.- Type exactly this in terminal:

Code:

mkdir -p /home/user/.config/scorpius
echo android=true >/home/user/.config/scorpius/yappari.conf

6.- Start Yappari, type your N900 phone number with country code
7.- Yappari should detect the number was already registered using an Android client and log in without any problem.

Also if you are one of those users that love to go back and forth to NITDroid, if you use this method, you can switch from Yappari to NITDroid + Whatsapp and back without re-registering each time.