When it launched the LG G6 last month, T-Mobile priced it at $650 full retail, or $26 upfront followed by 24 monthly installments of $26. But that was before Samsung's Galaxy S8 hit the streets. Now that the G6 has a big competitor going after it, the magenta carrier has decided to give LG's offering an even bigger advantage, price-wise. So at the moment you can purchase a G6 from T-Mobile for only $500 outright, or $20 upfront and $20 monthly for two years if you're into doing the installment thing. Additionally, if you buy before May 7 you get a free Google Home smart speaker...
Source: http://www.gsmarena.com/tmobile_is_now_selling_the_lg_g6_for_just_500-news-24860.php