The Uninvited Calls

Nobita had a long chat on the phone with Shizuka, but Nobisuke can't wait any longer and he yelling at Nobita to continue his story to Shizuka's house.

At his room, Nobita asked Doraemon if there was anything he could do. Doraemon pulled out a Tele-Phoneter a string telephone-like device made of two cup-like objects connected by a string. As instructed by Doraemon, Nobita said "Hello" into one of the phone, then he get sucked into the phone and popped out into the other end of the string phone. The string is stretchy, so it can be used even when you're far away.

Nobita took one of the phones and went to the kitchen. Not minding his mom calling out to him, he said "hello," and before he knew it, he was back in his room, where the other phone was.!?