Tang Kim Dan, 27, was charged with confiscation of property, the provincial People's Court heard.
Dan was riding a motorbike along a national highway on February 20 when he spotted Franziska Schwaeler, a 19-year-old German. A mobile phone, worth VND2.2 million ($95), was attached on her motorbike, Dong Nai newspaper reported.
As Dan absconded with the phone, Schwaeler attempted a pursuit but fell from her bike.
The culprit subsequently sold the phone for VND300,000 ($13). He was arrested by the police a month later.