The Samsung Focus or ZTE Orbit?
The US Congressional Intelligence Committee has labeled Huawei and ZTE as security threat to the US and is advising firms to not do business with them. This follows after an 11-month investigation into both companies where their cooperation on certain matters was, according to the committee, sufficiently lacking.
The charges (at least for Huawei) go back a few years here in the US where they were accused of high-level espionage of Nortel, with some even alleging that their IP theft helped destroy the company (see the excellent CNBC documentary on it here).
Cisco and Motorola have also accused Huawei of either stealing IP or their own employees to gain knowledge of those companies. In addition, charges of bribery, corruption and discriminatory behavior have been alleged too.