If you run out of 250, you can only increase to 1000 or unlimited. It doesn’t “go back” or “reset” to the complimentary plan. BUT what I like to do is run out my 100, then purchase a plan if I still need to because it DOES reset your 30 days when you upgrade. So if I time things right, I could theoretically get 350+ photos in a month or so with 100 of those being free. Also, let’s say I run out of 250 and decide to upgrade to 1000…I get credit for the plan I already bought and they just charge me the difference for the bigger. So if I spent $5 and I need more pics, I get 750 more for the remainder of the month for the additional $5 instead of cold-resetting me for $10. This is how I do things in Oct and Nov when I am getting twice the number of pics per day in high traffic cam locations.