I was just re-watching the Stargate SG-1 episode "Threads". As Carter finds herself in an awkward moment with Jack and his recently found companion at his backyard barbecue, she is interrupted by her cell phone. To answer the call, she takes out something looking more like a woman's compact than a phone.
Was she holding a real cell phone? If it was a studio prop, was it modeled on a real cell phone commercially available at the time? If so (real or imitation), what was the real cell phone make and model? It seems to me so unusual as to perhaps be a product placement, but if so, a very subtle one.