Texting is asynchronous communication meaning that people can send/respond whenever they want to. Phone conversation is synchronous communication because people have to respond within a certain amount of time (pretty much like face to face communication except your not infront of the person, you are merely talking over a medium). Some people just claim to be too busy to call. Some people work so they cannot really make personal calls at work without some sour faces. Also, some people suck at multitasking where they just can't talk on the phone and do other things at the same time. Some people could be shy and thus refrain from actually communicating with a person.
I much prefer the phone. I'm not patient enough for texting.
I will do my best to reply with an educated, humble and honest answer. Ultimately, it is up to you whether you want to listen to my advice or ignore it completely. Sometimes, my advice may be wrong; occasionally, it will be right. Regardless, I want to do my best to give people answers they are seeking.