Looking to Upgrade but not sure what promos I qualify for I have a note 5 and I'm looking to Upgrade to a note 10+ 5g and am currently still on tmobile one with 3 lines, a watch and one device installment plan for $10  totaling $169 a month. 

Every promo seems to only apply to new customers or adding a line I have no use for. 

I also want to pay $500 down on my new phone but don't see away of doing so online and all my local stores don't have them in stock any advice?

Thanks for any help or advice!