CTIA是强制性标准吗？

不是
他只是一个民间协会
三星的外观好，应该可以抵消一部分性能呵呵

是谁告诉楼主三星的天线不好啊？

CTIA和美国的FCC是两个不同机构，FCC是强制的认证，CTIA一般运营商要

我也感觉三星的CDMA手机很一般
另外，给楼主一段话。应该算是官方回答。
节选自CTIA Program Management Document
1.5. Is CTIA Certification Mandatory?
The CTIA Certification Program is a voluntary program operating at the request of and for the benefit of CTIA members. CTIA Certification is not a requirement for sale of a product in North America. The Program is developed by CTIA with the assistance of industry advisory groups comprised of representatives from the wireless carriers, product vendors, testing laboratories and test equipment vendors.

申明：网友回复良莠不齐，仅供参考。如需系统了解手机天线设计，可以学习业界专家讲授的手机天线设计培训教程。