আজ থেকে বাংলাদেশে চালু হলো নতুন কলিং সিস্টেম VoLTE in Bangladesh Interested users can enjoy the VoLTE service by dialling *86583#. Officials will then reach out...
http://telecomtutorial.info Complete End to End Tutorial on Fundamentals & Basics of VoLTE , IMS Technology & VoLTE Overview ( Voice Over LTE ) - What is VoLTE ...