I downloaded the newest one which has call me button
this is the log
Registration started
Country code: LB
reg/req/exists/start
IMEI: 3538034773631
Request: https://v.whatsapp.net/v2/exist?cc=9...c1ff481327ce3&
Network activated: da94ca5c-d566-45c5-97fa-d407f6b2bccc
Network activated: da94ca5c-d566-45c5-97fa-d407f6b2bccc
Reply: {"status":"expired","login":"96171961836","pw": "rQ/Jy8rIB7ZFPqHkWDNPSoDOxew=","type":"existing","expi ration":1368731241,"kind":"free","price":"US$0.99" ,"cost":"0.99","currency":"USD","price_expiration" :1372899249}

Connection: close
Server: Yaws 1.94
Date: Fri, 31 May 2013 23:21:24 GMT
Content-Length: 214
Content-Type: text/json ; charset=utf-8
reg/req/exists/expired
User 96171961836 is not registered.
reg/req/sms/start
IMEI: 356034773631
Request: https://v.whatsapp.net/v2/code?cc=96...c1ff481327ce3&
Reply: {"status":"expired","login":"96171961836","pw":"ER cNCVfz5G/W+Xfq/cPTEXZNXxk=","type":"existing","expiration":136873 1241,"kind":"free","price":"0.99 \u062f\u0648\u0644\u0627\u0631 \u0623\u0645\u0631\u064a\u0643\u064a","cost":"0.99 ","currency":"USD","price_expiration":13732206 92}

Connection: close
Server: Yaws 1.94
Date: Fri, 31 May 2013 23:21:26 GMT
Content-Length: 279
Content-Type: text/json ; charset=utf-8
reg/req/sms/expired
User has quit the application
Application destroyed