Digital Enhanced Cordless Technology is converting your voice into 0s, and 1s and sending that digital connection over the 1.9Ghz band for greater range while still offering high voice fidelity. Even if you find a 5Ghz cordless phone, you would get the same benefit, but a shorter range. DECT should be the industry standard for home cordless telephones. This is not cellular phone services. This is plugging your DECT phone into an ATA, and that would carry calls as long as you are in range. If your telephone ports still work, you can also plug your DECT phone into the telephone jack.