Trademark Class 38: Telecommunications Services
Consider registering under Trademark Class 38 if your business will be offering telecommunication services for talk or messaging.
Complete Listing of All Goods in Class 38
Examples of trademarks in Class 38 include TV JAPAN (broadcast of television programs), DOGPILE (computer telecommunications services), and NEON (cable TV broadcasting services).
However, you would not use Class 38 if you were registering radio advertising services or telephone marketing (telemarketing) services