problem with Eric 1018. It shows full network, but when I try to call, it goes down

[sat]

I tried to change plastic transiever, transiever key (6 legs left side of it), then I tried to change filter. Nothing helps. What to do?

[themobileking]

Dear friend,<br />Please change the power amplifier.and if still the prob persists send me a mail. i recieve a lot of sets with the same prob and repair them 95%<br />regards,<br />themobileking