Some people can’t get a hold of you because you may not have listed your contact details in a method they like to communicate.
Depending on age and experience, some prefer to text or email and never pick up the phone.
List all contact methods on your LinkedIn profile. Not just one or a couple.
Because you may not get a second chance to be contacted, even if you list all the phone numbers you can get your hands on!
No operators are standing by anymore.