Unfortunately not. You have to get the phone on one payment.
The rule to apply for BoostUp! is to have the last 12 or more consecutive payments on time.
Hi there, johnsonchelsi22. Thank you very much for contacting us.
Existing customers who are on a monthly plan and have made at least 12 consecutive on-time payments are eligible for the BoostUP! installment option. You can see if you're eligible in account online once you log in with your phone number and PIN. Here's the link: https://myaccount.boostmobile.com/?INTNAV=TopNav:MyAccount
Hi, johnsonchelsi22! Any Boost customer with a monthly plan who has made at least 12 consecutive on-time payments and is not enrolled in the Premier Grace Period program is eligible for BoostUP! Here https://www5.boostmobile.com/#!/support/faq/account-management/BoostUP/ you can find the details.