Verizon Wireless customers, check your Verizon Up account for a free $10 Bonus Reward from GrubHub (YMMV). You need to have the Verizon app and be subscribed to the Verizon Up reward program. This reward should automatically appear free to many customers and does not require any credit to use. The Grubhub offer says it is for first time clients, so you may need to download the app and register a new account.
Log in to the My Verizon App
From the My Verizon App, tap on the upper left drop down menu
Select Verizon Up
Find the offer under "Bonus Rewards"
Claim the current offer: Grubhub $10 off delivery.