i'll call you later - A sneaky way to say you're not going to call, but you don't

A sneaky way to say you're not going to call, but you don't want to be rude. You're just being a coward.

I'll call you later. (He said this after I sent him a funny meme.)

I'll call you later. (He said this right before hanging up on me.)

I'll call you later. (He said this while eating pizza.)