The Wall Street Journal reported that analysis by UBS and Japanese technology firm Fomalhaut Techno Solutions found that Huawei's latest phones — the Mate 30 — had no US parts.
The Trump administration placed Huawei and 68 of its affiliates on its Entity List on 16 May, meaning that the company would have to seek permission to purchase any American components it needed to manufacture its products.
This came after many years of accusations that Huawei posed a danger to the US because the Chinese Government could use its technology as a means of spying.
The ban applies to US-based companies and the report said that since May, Huawei had added a number of non-US suppliers and used components from companies based in other countries.
The Fomalhaut analysis showed that Huawei had cut down its reliance on American suppliers in smartphones launched after May, including the Y9 Prime and Mate devices.
For example, the Mate devices contained chips made by Holland's NXP Semiconductors as replacements for those made by US firm Cirrus Logic.
A Huawei spokesperson was quoted as saying that while the company preferred to buy from US supply partners, "If that proves impossible because of the decisions of the US Government, we will have no choice but to find alternative supply from non-US sources.”
The company's John Suffolk, the head of cyber security, told the WSJ that it was now able to produce its 5G base stations without using US components.
But the Chinese firm is yet to find a suitable replacement for Google's Android operating system that it was using on its smartphones. The Mate 30 launched without Google's Maps, Gmail and other proprietary apps.