Differences between the two Nexus 5 models, D820 and D821

North America (D820) Nexus 5 model:
Outside North America (D821) Nexus 5 model:
- GSM: 850/900/1800/1900 MHz
- CDMA: Band Class: 0/1/10
- WCDMA: Bands: 1/2/4/5/6/8/19
- LTE: Bands: 1/2/4/5/17/19/25/26/41
Outside North America (D821) Nexus 5 model:
- GSM: 850/900/1800/1900 MHz
- WCDMA: Bands: 1/2/4/5/6/8
- LTE: Bands: 1/3/5/7/8/20
source: AndroidCentral