I’m can be used with preposition in, at, and on. When you enter a physical location like a building or a room, you would use the word ‘in’ with I’m. The preposition ‘in’ specifies within the area, bounds or limit. You should use ‘in’ to denote ‘inside’. For example:
You can use ‘at’ to tell someone where are you currently. The word ‘at’ specifies the ‘near the area occupied by’. For example:
You can use ‘in’ for general location and ‘at’ for the specific location. For example:
” I’m in Delhi, at the conference. “
Use ‘in’ for inside and ‘at’ for near. For example:
The preposition ‘on’ specifies the non-physical location for example time being utilized by something else. It denotes that the person is working on something.