How will I know if my phone's being tapped?

I’m going to be working with confidential material in the Israeli army, in the intelligence division. (any bidders?)
I’ve heard that they check up on their people occasionally, tapping their phones and/or following them. Granted, the people who I’ve heard this from are probably paranoid, because who else would think and check if someone is tapping their phone and/or following them.
My question is, assuming that they do do it, is there a way for me to tell? Should I listen for “clicks”? I’m assuming they would use something very new and expensive, since they’re not hunting down criminals…

[I’m such an idiot! I gave them my cell phone number and I didn’t even have to!]

There’s another active thread about phone tapping in this forum. It looks very doubtful that you would hear clicks.