Here is the iPhone 13 mini, iPhone 13, iPhone 13 Pro, and iPhone 13 Pro Max availability for the afternoon of October 21st, 2021. 
There have been a ton of changes for AT&T as well as a couple of changes for both Verizon and T-Mobile.
Changes for the Carriers
AT&T
	- iPhone 13 mini - 256GB - Pink has changed from Oct 26 - Oct 27 to Out of Stock
- iPhone 13 mini - 512GB - Pink has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 mini - 128GB - Midnight has changed from Oct 29 - Nov 05 to Nov 01 - Nov 08
- iPhone 13 mini - 512GB - Midnight has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 mini - 128GB - Starlight has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 mini - 256GB - Starlight has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 mini - 512GB - Starlight has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 mini - 128GB - PRODUCT(RED) has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 mini - 256GB - PRODUCT(RED) has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 mini - 512GB - PRODUCT(RED) has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 128GB - Pink has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 256GB - Pink has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 512GB - Pink has changed from Oct 22 - Oct 25 to Oct 27 - Oct 28
- iPhone 13 - 256GB - Blue has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 512GB - Blue has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 128GB - Midnight has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 256GB - Midnight has changed from Oct 26 - Oct 27 to Out of Stock
- iPhone 13 - 128GB - Starlight has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 256GB - Starlight has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 512GB - Starlight has changed from Oct 22 - Oct 25 to Oct 27 - Oct 28
- iPhone 13 - 128GB - PRODUCT(RED) has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 256GB - PRODUCT(RED) has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 - 512GB - PRODUCT(RED) has changed from Oct 22 - Oct 25 to Oct 27 - Oct 28
- iPhone 13 Pro - 128GB - Sierra Blue has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 256GB - Sierra Blue has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 Pro - 1TB - Sierra Blue has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 128GB - Silver has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 256GB - Silver has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 Pro - 512GB - Silver has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 1TB - Silver has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 128GB - Gold has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 256GB - Gold has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 512GB - Gold has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 1TB - Gold has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 128GB - Graphite has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro - 256GB - Graphite has changed from Oct 22 - Oct 25 to Oct 25 - Oct 26
- iPhone 13 Pro Max - 128GB - Sierra Blue has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 128GB - Silver has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 256GB - Silver has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 512GB - Silver has changed from Oct 29 - Nov 05 to Nov 01 - Nov 08
- iPhone 13 Pro Max - 1TB - Silver has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 128GB - Gold has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 256GB - Gold has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 512GB - Gold has changed from Oct 29 - Nov 05 to Out of Stock
- iPhone 13 Pro Max - 128GB - Graphite has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 256GB - Graphite has changed from Nov 25 - Dec 03 to Nov 29 - Dec 06
- iPhone 13 Pro Max - 1TB - Graphite has changed from Dec 10 - Dec 17 to Dec 13 - Dec 20
T-Mobile
	- iPhone 13 mini - 512GB - Pink has changed from Oct 22 - Oct 25 to Nov 12 - Nov 29
- iPhone 13 - 128GB - Pink has changed from Oct 26 - Nov 01 to Oct 24 - Oct 27
- iPhone 13 - 128GB - Starlight has changed from Oct 20 - Oct 25 to Oct 28 - Nov 12
Verizon
	- iPhone 13 - 256GB - Blue has changed from Nov 05 to Nov 12
- iPhone 13 Pro Max - 128GB - Silver has changed from Dec 03 to Dec 10
	iPhone 13 mini
	
		
			| Sim-Free | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | Oct 29 - Nov 2 | Oct 29 - Nov 2 | Oct 29 - Nov 2 | 
		
			| Blue | Oct 29 - Nov 2 | Oct 29 - Nov 2 | Oct 29 - Nov 2 | 
		
			| Midnight | Oct 29 - Nov 2 | Oct 29 - Nov 2 | Oct 29 - Nov 2 | 
		
			| Starlight | Oct 29 - Nov 2 | Oct 29 - Nov 2 | Oct 29 - Nov 2 | 
		
			| PRODUCT(RED) | Oct 29 - Nov 2 | Oct 29 - Nov 2 | Oct 29 - Nov 2 | 
	
	iPhone 13
	
		
			| Sim-Free | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | Nov 2 - Nov 5 | Nov 2 - Nov 5 | Oct 29 - Nov 2 | 
		
			| Blue | Nov 2 - Nov 5 | Nov 2 - Nov 5 | Oct 29 - Nov 2 | 
		
			| Midnight | Nov 2 - Nov 5 | Nov 2 - Nov 5 | Oct 29 - Nov 2 | 
		
			| Starlight | Nov 2 - Nov 5 | Nov 2 - Nov 5 | Oct 29 - Nov 2 | 
		
			| PRODUCT(RED) | Nov 2 - Nov 5 | Nov 2 - Nov 5 | Oct 29 - Nov 2 | 
	
	iPhone 13 Pro
	
		
			| Sim-Free | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
		
			| Silver | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
		
			| Gold | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
		
			| Graphite | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
	
	iPhone 13 Pro Max
	
		
			| Sim-Free | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
		
			| Silver | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
		
			| Gold | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
		
			| Graphite | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | Nov 19 - Nov 29 | 
	
	iPhone 13 mini - Carriers
	
		
			| T-Mobile | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Nov 12 - Nov 29 | 
		
			| Blue | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Oct 21 - Oct 25 | 
		
			| Midnight | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Nov 12 - Nov 29 | 
		
			| Starlight | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Nov 12 - Nov 29 | 
		
			| PRODUCT(RED) | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Oct 21 - Oct 25 | 
	
	
		
			| Verizon | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | In Stock | In Stock | In Stock | 
		
			| Blue | In Stock | In Stock | In Stock | 
		
			| Midnight | In Stock | In Stock | In Stock | 
		
			| Starlight | Oct 29 | In Stock | In Stock | 
		
			| PRODUCT(RED) | Dec 03 | In Stock | In Stock | 
	
	
		
			| ATT | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | Out of Stock | Out of Stock | Oct 25 - Oct 26 | 
		
			| Blue | Oct 29 - Nov 05 | Out of Stock | Oct 27 - Oct 28 | 
		
			| Midnight | Nov 01 - Nov 08 | Out of Stock | Oct 25 - Oct 26 | 
		
			| Starlight | Oct 25 - Oct 26 | Oct 25 - Oct 26 | Oct 25 - Oct 26 | 
		
			| PRODUCT(RED) | Oct 25 - Oct 26 | Oct 25 - Oct 26 | Oct 25 - Oct 26 | 
	
	iPhone 13 - Carriers
	
		
			| T-Mobile | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | Oct 24 - Oct 27 | Oct 21 - Oct 25 | Oct 21 - Oct 25 | 
		
			| Blue | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Oct 21 - Oct 25 | 
		
			| Midnight | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Oct 21 - Oct 25 | 
		
			| Starlight | Oct 28 - Nov 12 | Oct 21 - Oct 25 | Oct 21 - Oct 25 | 
		
			| PRODUCT(RED) | Oct 21 - Oct 25 | Oct 21 - Oct 25 | Oct 21 - Oct 25 | 
	
	
		
			| Verizon | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | In Stock | Nov 12 | In Stock | 
		
			| Blue | In Stock | Nov 12 | In Stock | 
		
			| Midnight | In Stock | Nov 12 | Nov 05 | 
		
			| Starlight | In Stock | Nov 12 | In Stock | 
		
			| PRODUCT(RED) | In Stock | Nov 05 | In Stock | 
	
	
		
			| ATT | 128GB | 256GB | 512GB | 
	
	
		
			| Pink | Oct 25 - Oct 26 | Oct 25 - Oct 26 | Oct 27 - Oct 28 | 
		
			| Blue | Oct 27 - Oct 28 | Oct 25 - Oct 26 | Oct 25 - Oct 26 | 
		
			| Midnight | Oct 25 - Oct 26 | Out of Stock | Oct 27 - Oct 29 | 
		
			| Starlight | Oct 25 - Oct 26 | Oct 25 - Oct 26 | Oct 27 - Oct 28 | 
		
			| PRODUCT(RED) | Oct 25 - Oct 26 | Oct 25 - Oct 26 | Oct 27 - Oct 28 | 
	
	iPhone 13 Pro - Carriers
	
		
			| T-Mobile | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Oct 21 - Oct 25 | 
		
			| Silver | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Oct 21 - Oct 25 | 
		
			| Gold | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Oct 21 - Oct 25 | 
		
			| Graphite | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Oct 21 - Oct 25 | 
	
	
		
			| Verizon | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Nov 19 | Dec 03 | Nov 12 | Nov 05 | 
		
			| Silver | Dec 03 | Dec 17 | Nov 19 | Dec 03 | 
		
			| Gold | Dec 03 | Dec 03 | Nov 12 | Dec 03 | 
		
			| Graphite | Nov 19 | Nov 05 | Nov 05 | Dec 10 | 
	
	
		
			| ATT | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Nov 29 - Dec 06 | Oct 25 - Oct 26 | Oct 29 - Nov 05 | Nov 29 - Dec 06 | 
		
			| Silver | Nov 29 - Dec 06 | Oct 25 - Oct 26 | Nov 29 - Dec 06 | Nov 29 - Dec 06 | 
		
			| Gold | Nov 29 - Dec 06 | Nov 29 - Dec 06 | Nov 29 - Dec 06 | Nov 29 - Dec 06 | 
		
			| Graphite | Nov 29 - Dec 06 | Oct 25 - Oct 26 | Oct 29 - Nov 05 | Nov 19 - Nov 29 | 
	
	iPhone 13 Pro Max - Carriers
	
		
			| T-Mobile | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Oct 21 - Oct 25 | 
		
			| Silver | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | 
		
			| Gold | Nov 09 - Nov 23 | Oct 28 - Nov 12 | Oct 21 - Oct 25 | Nov 17 - Dec 01 | 
		
			| Graphite | Oct 28 - Nov 12 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | Nov 17 - Dec 01 | 
	
	
		
			| Verizon | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Dec 03 | Nov 19 | Oct 29 | Dec 10 | 
		
			| Silver | Dec 10 | Nov 12 | Oct 29 | Nov 19 | 
		
			| Gold | Dec 03 | Dec 03 | In Stock | Nov 19 | 
		
			| Graphite | Dec 10 | Dec 03 | Nov 05 | Dec 03 | 
	
	
		
			| ATT | 128GB | 256GB | 512GB | 1TB | 
	
	
		
			| Sierra Blue | Nov 29 - Dec 06 | Nov 05 - Nov 12 | Out of Stock | Nov 19 - Nov 29 | 
		
			| Silver | Nov 29 - Dec 06 | Nov 29 - Dec 06 | Nov 01 - Nov 08 | Nov 29 - Dec 06 | 
		
			| Gold | Nov 29 - Dec 06 | Nov 29 - Dec 06 | Out of Stock | Nov 19 - Nov 29 | 
		
			| Graphite | Nov 29 - Dec 06 | Nov 29 - Dec 06 | Oct 27 - Oct 28 | Dec 13 - Dec 20 |