Is this model compatible with Verizon
from description:
Compatible with CDMA and GSM carriers, including Verizon Wireless, Sprint, AT&T and T-Mobile
Also compatible with prepaid SIM Kits, including Verizon Wireless Prepaid, Cricket Wireless, Tracfone, Net10, H2O, GoPhone and Simple Mobile.
and do best buy allow payment splitting
I don't think you can split tender online. Perhaps in store. If you want to split tender to use multiple Amex offers you can always buy a $250 bestbuy gift card but the downside is you'll only get the amex extended warranty on the amount paid on the Amex. Not the amount paid by giftcard