I have the Samsung Galaxy S4. In my house and my in laws house I do not have data connection. I "miss" calls but don't have a miss call icon, only a voicemail. I can't make calls and when I am able to answer a call I cannot complete the call correctly. I have tried removing my SIM card, restarting the phone, etc. My in laws have iPhones and don't have issues. My wife has the Samsung Galaxy S3 and has the same issues. This morning she took a call and had to advise the individual she could not understand them and to call back and leave a message. This is highly inconvenient. Please advise on some options to correct this. Thanks!