Generate a sentence that begins with the phrase "I remember when".
I remember when people used to call their friends on the phone just to chat, rather than using social media and instant messaging.
Complete the following task based on the instruction and optional input provided.### Instruction:
Generate a sentence that begins with the phrase "I remember when".

### Output:
I remember when people used to call their friends on the phone just to chat, rather than using social media and instant messaging.