What is a one-sentence summary of the following article?
Check to see if all your calls to your friend have been missed. What’s the ratio of missed calls to answered calls? Notice the call length, the time you called them, how often you call them and whether or not they have called you. If the balance of missed calls, answered calls and placed calls seems off to you, think of other reasons this may be. Perhaps their phone plan is limited or they can’t buy phone credit/minutes/top-up regularly. Think of things that your friend might be busy with. If you know them well and are aware of their schedule, think of any activities they might be engaged in. Perhaps they're in a meeting or is driving somewhere. Perhaps this is the time of day they take a nap or they sleep early. Have they mentioned any event that they might be attending that is not part of their regular routine? Perhaps their ringer is off/her phone is on silent or the battery needs to be charged. Don’t jump to conclusions. They may have a genuine reason for not answering your call. Has anything happened recently that has made things awkward between you and your friend? Can they have any reason for avoiding your call other than being busy? Think about their behavior toward you recently. If they've been cold, possibly distant, then there’s a possibility that your calls are being avoided. Be careful. Again, be careful not to jump to conclusions. Your assessment of your relationship may be biased. Consider asking an unbiased friend for advice on the matter. Pick a time that you know they're available to talk. When you call, let the phone ring for at least a minute, in case they're rushing to pick it up. Their phone might just be out of reach or in another room. Give them the benefit of the doubt.

Summary:
Check your call log. Determine whether you're calling at a convenient time. Consider the state of your relationship. Call back at a different time.