RF review before volume found the impedance note in the drawings (h = 0.21 mm, er 4.3) does not match the board-file stackup (about 0.1 mm), putting a 0.4 mm line near 30 ohms; signal vias leave about 1.9 mm2 of ground voids under RF traces, only about 5 stitching vias run along the 17.3 mm LTE trace, and LTE has no matching footprint so an antenna retune means a respin.