After a fight Hayate, Nagi heads to the apartment complex to hang out.  But her “little sister” is the only one home.  This might be Nagi’s chance to find out what Ruri’s real goal is. 
I was worried because your 
cell phone wasn't working.
Estaba preocupado porque 
su teléfono no funcionaba.
Estaba preocupado porque no me cogía el teléfono...
Fiquei preocupado porque seu
 celular não estava atendendo.