Prepaid SIM cards may be used temporarily or for service purposes. A contract SIM card will always be more cost

Every picture has 10±2MB depending in the complexity of the image, so the data plan in your SIM should be
calculated by the following formula:

Monthy data plan= 12(MB per picture) *number of cameras * shootings per day * 30(days per month)

CropVIEW with 2 cameras 2 shootings per day will need minimum monthly data plan:
12MB * 2 cameras* 2 shoots per day *31 days per month = 1.5GB/month