Inputing a phone number into the contact field

Inputing a phone number into the contact field

I'm looking to move forward with a subscription but I have been running into a lot of issues. The one that frustates me the most is an error appearing as I'm not inputting my contacts phone number in correctly. I've tried taking out the dashes, adding the dashes, whatever can get it to save. I've just been my contacts phone numbers in the description. Any help?