Please help me translate these into Turkish? Thanks

1) I cannot reach you on your phone anymore. What happened?
2) Did you change your phone number?
3) Why you disappear all the time?

I think the firs two are:
1) Seni artık telefonda erişemiyorum, ne oldu?
2)Telefon numarasını değiştirdin mi?

Thanks.

1)

Did you change your phone number (last Friday)?
this is a simple past form. and used for a certain past time (example: last friday)


a)
" (Geçen cuma) telefon numaranı değiştirdin mi? "
(this form emphasizes the verb.
nearly means;
"what did you do in last friday?")


b)
" Telefon numaranı (geçen cuma) mı değiştirdin ? "
(this form emphasizes the time.
nearly means;
"when did you change your phone number?)


and another form;


2)

a)
Have you (ever) changed your phone number?

" Telefon numaranı (hiç) değiştirdin mi? "

(this form uses past perfect tense)


or

b)
" Telefon numaranı mı değiştirdin? "

Emphasizes "phone number" by using;
"telefon numaranı"
and
"mı"
elements in -near by near- sequence.

nearly means;
(did you changed your telephone number or your classroom? or your pet's name, or your country? what did you change? )