I usually tend to tell i'm in the room. But i get confused when i get doubts with respect to what to use between "in the room" and "in room" for the formation of error free sentence.
closed as off-topic by Janus Bahs Jacquet, choster, user66974, Mari-Lou A, tchrist♦ Jul 28 '15 at 3:56
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"in-room" is used in phrases such as "in-room WiFi" or "in-room massages," but not under the circumstances you're asking about. "In the room" and "in room" are not interchangeable.
"I'm in the room" is the phrase you should be going with. If you're talking about the room for the first time with person X, use 'a', as in "In a room which is on so and so floor". The "in room" structure is generally only used when the room is named or numbered. Like "I am in room 2813 of Hotel Lakshminath."