A:AnswerYou can just walk out after payment unless you want to buy accessories for the phone like i did other than that your fine to just purchase and leave as please
A:Answeryes, most sim cards can be converted to esim just check with your carrier. this phone doesnt have the sim card slot so thats the only way to activate it.
A:AnswerEs problema de la telefonía! Y más si hablas a líneas de otra telefonía, al menos que es todas tus llamadas sea igual pero de T móviles a T móvile quizás se escuche bien. Lo mismo pasa con at&t