Billing is happening for Amazon Pinpoint USE1-PhoneNumber-Tollfree,But there are no resources enabled

Based on the information provided, it appears you are being billed for an Amazon Pinpoint toll-free phone number in the US East 1 (USE1) region, even though you don't see any active resources. This situation can occur because Amazon Pinpoint charges a monthly fee for leasing toll-free numbers, regardless of usage.

Amazon Pinpoint charges $2 per month for each toll-free number leased. This is a flat fee that applies even if you're not actively using the number to send messages. Toll-free numbers in Pinpoint are 10-digit numbers that begin with one of these three-digit codes: 800, 888, 877, 866, 855, 844, or 833.

The billing you're seeing for "USE1-PhoneNumber-Tollfree" indicates that you have at least one toll-free number allocated to your account in the US East 1 region. Even if you're not currently using this number in any active campaigns or pools, you're still being charged for reserving it.

To address this:

1. Check your Amazon Pinpoint console in the US East 1 region for any toll-free numbers you may have forgotten about.
2. If you find unused toll-free numbers, consider releasing them to stop the monthly charges.
3. If you can't locate the numbers in the console, contact AWS Support for assistance in identifying and potentially removing the unused toll-free numbers.

Remember, simply not using a leased toll-free number doesn't stop the charges - you need to explicitly release the number to avoid ongoing fees.
Sources
Amazon Pinpoint Pricing | Multichannel Customer Communications | AWS

The usage line on your bill indicates you had a phone number for 0.825 of the Month. Is it possible that you had a phone number and deleted it part way through the month?

If you look at Cost Explorer, filter include the service Pinpoint and filter include the usage type of phonenumber, AND change the view for last month to daily, do you see the charge appear for part of the month, but not the whole month?