"No service" when texting non-iphone users
Since purchasing the iPhone 6+, I have had continual problems when texting non-iPhone users. It causes my phone to have "no service". Eventually, the texts go through, but they are delayed and my phone is without service for a short while. Apple has replaced the phone and spent time consulting with me trying to resolve, but could not do anything. AT&T replaced the SIM card. The problem still not resolved. I am a real estate agent in a busy market and this issue is causing me problems. Is anyone else experiencing this problem? Any idea as to how to resolve? Thanks.
iPhone 6 Plus, iOS 8.4.1