From the list of devices (at the top), select the mobile number the limit should be applied to.
From the left menu, click Limits & Controls to expand.
Click Limit purchases.
If necessary, click No limit to uncheck the box.
From the per month field, enter the purchase limit in dollars (e.g., 50).
Once the limit is reached, purchases billed to Verizon are restricted until the next billing cycle.
Purchase limits must be less than $100 and apply to Apps, Games, Ringtones, Music, eBooks, Movies and Gifts.
At this time, free text alerts aren't sent for purchase limits.