It’s worth being careful with posts offering university admission forms, diploma services or changes of institution through a private phone number. For something as important as admission, applicants should always verify the information directly with the university and use official application channels before sending documents or making payments.
The same habit applies elsewhere online: I usually check who operates a service before trusting it. Even when browsing entertainment sites such as https://bigcasino-italiana.net/, checking the terms, licensing information and payment conditions beforehand is a sensible precaution. A few minutes of verification can prevent much bigger problems later.