XCAL-Solo is a handheld air interface measurement Solution for QoS, QoE test without any limitation by attaching portable H/W to Smartphone to cover wide range application testing, including Audio MOS measurement, network measurement and data on the smartphone in real-time. XCAL-Solo also supports creating and editing measurement scenario and various auto call tests (Voice, VoLTE, FTP, Web, E-Mail, iPerf, Ping, YouTube, Multi-Call, Multi-RAB, Multi-Session, UDP (*only IoT) with user friendly touch interface from Android OS GUI.