I am using Q26 elite module. When powered ON, Iam not getting any wind response and also not getting any responses to AT commands. Then I removed SIM card in the SIM circuit (In Power ON) then Iam getting responses and what I have observed is SIM RST pin is toggling when SIM is peresent. Due to this Iam not able connect to network and Iam unable to get any response.
Take a look at the FAQ/Wiki thread - there’s a load of stuff about power supply problems there: