if you forgot your mobile yesterday who sent me the sms right after my sms?

Dün telefonunu unutsaydýn,kim sms bana gönderdi ?

My try (but I missed out the ´right after my sms´

 Dün cep telefonunu unuttuysan eðer, kim mesajýmdan hemen sonra bana sms yollamýþ?

or:

Dün cep telefonunu unuttuysan eðer, bana mesajýmdan hemen sonra sms yollayan kimdi?

(Ýf you forgot your mobile yesterday, who was the one that sent me an sms right after my sms?)

Thanks for the corrections. I don´t understand ´unuttuysan´ though. Was ´unutsaydýn´ incorrect?

Yes because they are different.

1) unuttuysan = unut-tu-(y)-sa-n = verb stem + past time + connection y + conditional + 2nd pers sing

--> If you have forgotten / if you had forgotten / In case you have/had forgotten. So the action is in the past, and conditional is addes for the ´if´-meaning

2) unutsaydýn = unut-sa(y)-dý-n = verb stem + conditional (connection y) + past time + 2nd pers sing

--> Had you forgotten (but you didn´t!)

Evde telefonunu unutsaydýn, bana mesaj atamazdýn

- Had you forgotten your phone at home, you wouldnt be able to text me.

Keþke dün sana söylediklerimi unutsaydýn!

- If only you would forget the things I told you yesterday!

Telefonunu unuttuysan, nasýl mesaj yazdýn bana?

- If you had forgotten your phone, how did you text me?

Keþke Ýstanbula gelseydin, beraber gezerdik

- If only you had come to Istanbul, we would go sightsee together

Ýstanbula gittiysen, neden bana haber vermedin?

- If you went to Istanbul (if it is so that you went to Istanbul), why didn´t you let me know?

Doktora gitseydin!

- If only you went to the doctor! (you should have gone to the doctor! 

Doktora gittiysen þuan beklemekten baþka çare yok

- If you have already gone to the doctor, theres nothing else to do but wait.

Thanks for all the trouble you went to explaining all that!

 Glad to help Hope you understood!