I have had major issues with mine lately.  Will be on the phone talking and it drops the call and says "call failed". Now in the past week, I have had either "no service" or "searching" on the top of mine where I've always had 4 bars.  Today I dealt with the no service and searching for almost 4 hours, making it impossible for me to place a call or send a text.  I'm not sure what's going on that is causing this, but am really getting tired of it, especially as this is my only phone.