Reading Arabic on a mobile phone can be difficult because the script is too small. The open-source browser Kiwi solves that.
The word Allah is often written like a calligraphy - with the dagger Aleph. There are several ways to achieve that in Microsoft Word or Libre Office.
Times New Roman or Arial are not the only fonts to write in Arabic. Google Fonts offers many beautiful Arabic fonts for free - it works also for Apple/Mac.
Arabic fonts always look too small and unreadable on the browser. There are extensions for Chrome, Firefox and Opera that fix that. One is Wudooh.