Telecom Service One : Change of Address of Head Office and Principal Place of Business in Hong Kong and Facsimile Number

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.

Telecom Service One Holdings Limited

電 訊 首 科 控 股 有 限 公 司

(Incorporated in the Cayman Islands with limited liability)

(Stock Code: 3997)

CHANGE OF ADDRESS OF HEAD OFFICE AND PRINCIPAL PLACE

OF BUSINESS IN HONG KONG AND FACSIMILE NUMBER

The board of directors (the "Board") of Telecom Service One Holdings Limited (the "Company") hereby announces that the address of head office and principal place of business of the Company in Hong Kong will be changed to Unit 2, 2/F, Shun Fat Industrial Building, No.17 Wang Hoi Road, Kowloon Bay, Kowloon, Hong Kong with effect from 17 February 2020. The facsimile number of the Company will be changed to (852) 3579 3131. The telephone number and website of the Company will remain unchanged.

By Order of the Board

Telecom Service One Holdings Limited

Cheung King Shek

Chairman

Hong Kong, 17 February 2020

As at the date of this announcement, the chairman and non-executive director of the Company is Mr. Cheung King Shek; the chief executive officer and executive director of the Company is Mr. Cheung King Fung Sunny; the non-executive directors of the Company are Mr. Cheung King Shan and Mr. Cheung King Chuen Bobby; and the independent non-executive directors of the Company are Mr. Fong Ping, Ms. Kwok Yuen Man Marisa and Mr. Tso Ka Yi.

The English text of this announcement shall prevail over the Chinese text in case of inconsistencies.