The hottest phone in America right now is a $100 landline with no screen. Tin Can launched in April 2025, sold out batch after batch, and has moved hundreds of thousands of units. Greylock led their $12M seed in December. The three founders came out of a Seattle real estate startup that shut down the year before. The product is anti-tech. The growth engine is pure Silicon Valley. Calls between Tin Cans are free. Calling regular phone numbers runs about $8 a month per line. So every family…