if the sim port contacts are intact, get a sim replacement from your telco. try using some1 else's sim and verify its not the phone issue.
for sluggish roms:
1. master reset the phone
2. u need to flash ur phone with stock rom.
3. master reset again
4. flash rom of choice, use the energyrom
5. master reset again
6. let the auto customization setup finish
let us know how much faster it feels.