K&F Concept camera tripod you are asking, yes, you Canon rebel sl2 could be used on our tripod. Your camera could be used as long as it has a 1/4" standard screw interface; If your lens is large or telephoto zoom lens, please ensure to expand the leg angle, and hang some weight to the hook to increase its stability. For camera with telephoto zoom lens, you need to buy a tripod mount ring additionally for better balance.The center column also has a hook to hang weight on to lower the center of gravity on this tripod to make it more sturdy and less prone to vibrations which is awesome for photography where you take long exposures . 

hi,you can use an AT&T account if you have a nano sim card. 

the bag can hold canon 500mm f4 lens, 

For camera with telephoto zoom lens, you need to buy a tripod mount ring additionally or telephoto lens bracket for better balance) 

To hold telephoto lens, it is recommended to use a tripod mount ring additionally for better balance. Meanwhile, it is better to hang some heavy thing to the hook to lower the center of gravity on this tripod to make it more sturdy and less prone to vibrations.