The cell phone bases my customers have used were all good, including Straight talk, no bad stories. ZTE I am unaware of.
If you have good Internet service why not Ooma? It works exactly like any pay TV provider VOIP phone system, even security systems (equipment and systems can matter with security systems on any VOIP or Cell based line but most cases VOIP works everytime)
All you pay are the monthly "landline" taxes of less then $5.00. Unlimited nationwide everything, caller ID etc, free, one time purchase of the device, no other charges unless for some reason you want a few dozen options at a monthly charge.