This phone number has been calling me 3-4 times daily, including early mornings on weekends and sometimes later in the evenings during the week. They never leave a message so I don't know who it is.

I have been getting these calls almost every day for the past week. from 360-587-4607.
I don't answer unknown numbers and the caller doesn't even leave a message.
Anyone have an idea who is this caller?

It is T-Mobile.  They are reminding you that your bill is past due and wondering if you would like to make a payment.

Do you all have t-mobile cell phones? I just got the call too, called the number back and it is t-mobile!

keeps calling me about 3 to 4 times a day.  does not leave message.