What steps will reproduce the problem? Please provide a link to a
demonstration page if at all possible, or attach code.

1. Set iphone system language to English(US)/Traditional Chinese

2. Use 'GMSAutocompleteFilter' to get search results(see codes below)

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
GMSAutocompleteFilter *filter = [[GMSAutocompleteFilter alloc] init];
// filter.type = kGMSPlacesAutocompleteTypeFilterCity;

[placesClient autocompleteQuery:searchText
bounds:nil
filter:filter
callback:^(NSArray *results, NSError *error) {
if (error != nil) {
NSLog(@"Autocomplete error %@", [error localizedDescription]);
return;
}

self.placeResults = results;
[self.resultsList reloadData];

for (GMSAutocompletePrediction* result in results) {
NSLog(@"Result '%@' with placeID %@", result.attributedFullText.string, result.placeID);
}
}];

3. It returns Traditional Chinese/Simplified Chinese results.

P.S.
I guess the language of results is based on the sim card or the distributed country of the iPhone, because I have two iPhones behaving differently.

*********************************************************
For developers viewing this issue: please click the 'star' icon to be
notified of future changes, and to let us know how many of you are
interested in seeing it resolved.
*********************************************************