Developing Telecoms Newsletter Sign Up Keep up-to-date with the latest telecoms news in emerging markets globally. Subscribe to Developing Telecoms' FREE weekly newsletter. Afghanistan Bosnia and Herzegowina Cook Islands Samoa South Sudan, Republic of Sweden Uruguay Business/Industry/Finance User * Your personal data will not be shared with third parties. Click here to view our privacy policy. 376 Polish mobile operator P4, trading under the Play brand, will be conducting 4G and 5G trials in Warsaw with Samsung. The trials will test the interoperability between Play’s 2G/3G legacy networks and Samsung’s latest solutions, said a press release from the South Korean multinational electronics company.