Sprint LG LX400 must be available starting April 16. Sprint LG LX400 handset feature Qchat technology, and retail for $ 279. 99. Of course, after deductions and 2 years an agreement that is going to look at a price much lower. "Sprint LG LX400 is said to be similar to Muziq in office, but the Qualcomm CDMA Qchat technology, which is the equivalent to that of iDEN Push-To-Talk service, will be its main selling point.