solved! i lost signal for days! i downgraded the os, no luck. re upgraded, no luck. restart the phone, reinsert sim card, switching network mode no luck. it is obvious the hardware issue! but since i have lost my warranty, i found a way to get the signal back. the radio antenna is located at the lower part of the phone! the flat part under the bottom of the screen. i simply light hitting that part to my palm, with the screen side down, but i dont hit the screen to my palm, just the lower part of the phone, hit it lightly, boom i get my signal back! but if it doesnt work, just hit it a bit harder, plus hit the top area of the phone, the upper part above the screen, i do it everytime i lose signal, and it always work for me, i bet by hitting it, it trigges something in the radio antenna, so glad to have my XZ's signal back after 2 day of losing signal because of hardware fault.
