Does an android phone's screen light being on or off affect network status?

Question

For an android phone, does the screen being on or off affect the network status at all?

I am unable to run some network related USSD when phone light off or phone is locked.

Answer 1

No it doesn't effect it. Emails come through when the screen is off.

I was running a version of CyanogenMod that disconnected the WIFI when the screen was off tho but thats a custom ROM