$500 via Verizon e-gift card (sent w/in 8 wks). Activation of 4G LTE/5G phone on 5G Get More plan req’d. Device must remain active for 45 days. $500 charge back if service cancelled w/in 12 mos or eligibility req’s are no longer met. See vzw.com/bring-your-own-device for details.
A BlackBerry is a smartphone; assuming that is the phone you purchased under contract for your line, and your "3 months left" is accurate, the ETF would be $350 less 21 x $10 for the completed months of your contract, or $140.