Galaxy S6 won't send or receive calls. failed to send text messages
I got a new phone - a Galaxy S6 64 Gigs 2 months back. From some days now I'm not able to make or recieve phone calls. My friends said that they were calling me all day & evening leaving messages. I didn't reveive any VM. I can't even send or receive texts. It has always 2-3 bars and when I try to send a text and it fails, sometimes immediately. This is from the Maryland Heights, St. Louis area.
I contacted Technical support & they did some research on phone in safe mode & did factory reset 2 times & declared this phone has some issue.
They asked me to replace my phone with a refurbished Galaxy S6. I do not want to replace my new phone (2 month old now) with a refurbished one.
I don't know if it's settings related, a local tower issue, sim card, phone itself?
Any input would help, thank you.