Mansion rescue of Bella's storyline can be done or not in this update?
Not sure what you mean by "can be done". It's quest 10 of her storyline and you can complete it by following the directions Muhammad is giving you. Since the timer will likely run out in the process, just save every 2 moves and reload when the guy spots you. Yes, it's annoying, but it's doable.
To buy a car you need to go to the auto center - you'll need a driver's license (get one at the police station) and a note from the bank about your employment (need to work there for 4 in-game weeks and then go to Bridjet's office and ask for the note)
I went with martha to café many times, but then no action. Is there a sex scene with her?
I assume you're at stage 8 with her, when you take her to the cafe, make sure you ask her all personal questions during your conversation, then get her drunk & happy at 100, then when you take her back home and she starts teasing you with her feet, you should get an option "Say about Zeus" which will lead to a car sex scene
Where to find Enrique to take his smartphone?
On Friday evening (after 20:00) in the shopping area (where the barbershop and car dealership is), there's a hidden marker next to the car parked on the street. You'll find Enrique there hanging out with Esmeralda, Adriana and Leo from the barbershop. You can either pay him or kick his ass to get the phone from him.