Pastikan setting tanggal/jam/timezone di BB anda sudah benar.
Solusi #1
1. Buka: http://bit.ly/woIN2D (login)
2. Update your contact information : Isi No. HP
3. Save!
4. Silahkan coba login YM di BB
Solusi #2
1. Login ke: http://appworld.blackberry.com/webstore/
2. Klik menu Blackberry ID
3. Cek status email (Click confirm jika not confirmed)
4. Buka email anda - klik link konfirmasi
5. Login Blackberry ID dan cek kembali status email anda (pastikan sudah confirmed)
6. Coba login YM di BB source: http://bit.ly/yC3bFb
Solusi #3
1. Login ke e-mail yahoo anda via desktop komputer
2. Klik link “Hi, (nama anda)”, lalu pilih Account Info. Isi kembali password e-mail bila ditanyakan.
3. Di bagian Sign-In and Security, klik link Manage Apps and Website Connections.
4. Temukan Yahoo! Mail for BlackBerry, lalu klik tombol Remove.
5. Coba login lagi dari BlackBerry.
Solusi #4
1. Remove account email yahoo di device
2. Coba login ke YM
3. Jika berhasil, create ulanga account email yahoo di device
Solusi #5
Gunakan IM+ / Beejive