From a Home screen, navigate: Apps icon > Settings > Data usage (Wireless & networks section) then do one of the following:
Change Data Usage Cycle:
Tap the Menu icon (upper-right).
Tap Billing cycle.
Tap Billing cycle once more.
Configure the cycle date then tap SET.
Refer to the My Verizon website for billing cycle date.
Set Mobile Data Limit:
Mobile / cellular data is disabled upon reaching the specified data usage level indicated by the red limit line. To continue to use apps that require a data connection (e.g., Browser, Email, Market, etc.), Wi-Fi can be used or the mobile data limit must be manually adjusted (overage charges apply).
Tap the Limit switch to turn on .
Enter the desired limit (e.g., 5GB) then tap OK to confirm.
Set Mobile Data Warning:
A notification message appears upon reaching the specified data usage level indicated by the grey warning line.
Tap the Alert me switch to turn on .
Enter the desired limit (e.g., 4GB) then tap OK to confirm.