To be able to make contact or get in touch with someone (by phone, email, etc.).
後でまた連絡が取れるかどうか教えてください。
Please let me know later whether you'll be reachable.
台風のせいでまだ被災地とは連絡が取れていない。
Because of the typhoon, we still can't get in touch with the affected area.
彼とはもう数年連絡が取れていない。
I haven't been able to contact him for several years.