Nǐde shǒujī shì shénme páizi?
你的手机是什么牌子?
Which brand is your mobile phone?
你的(nǐde): your
手机( shǒujī): mobile phone
是(shì): is
什么(shénme): what
牌子(páizi): brand
Example:
A:你的手机是什么牌子?
Nǐde shǒujī shì shénme páizi?
Which brand is your mobile phone?
B:三星。
Sānxīnɡ.
Sumsang.