Me and 1 of my friend both using 3GS but problem with whatsapp we can't add each other even we reinstall the software strange other friends in my phonebook will automatic add up in whatsapp beside him wonder y?I just can use invite n SMS him to get whatsapp but till now still unable to add him to list

Thanks Eugene for the reply.
I can't get what u mean"Try checking ur own phone number whether it's been set correctly on ur own phone?"but shouldn be wrong number cause we been calling each many times just not sure y can't add him other friends np lol

Got a problem here,I got few friends in my contact which whapps won't recognize it and add to list auto,they confirm install and my name was in there favorite list and can msg me but my list don't have them what to do?
Thanks

Ok, both got each numbers... i'm in his list... but he not show up in my list... when he msg me... a number +60xxx xxxx show up.. i can msg him back... but he not in my list. Reinstall still the same. Btw i store his number straight 016xxxxxxx without country code.

Is it? How to know if he put country code in front in his phone? can teach me how to erase the country code in his phone? thanks