Registration in HTC Sense. What format is the phone number in?

Question

Android

When registering, they are asked to enter a phone number and show an example: (eg 9876543210) .
In what format should the number be entered?

• 79045555555
  
• [phone]
  
• 9045555555
  

Answer 1

the captain points to the third option

Answer 2

According to the mind, if you enter through +79
it should work.
All my life I have been introducing numbers into international. formats, no problems yet. Were if not entered.