Microsoft Lumia 550, 750, and 850 specifications revealed, uninspiring hardware expected | TelecomTalk
Lumia 550: Inserting Sim & SD Card, Keys & Parts support videos
Microsoft Lumia 550 - Specifications
Microsoft Lumia 950 - Wikipedia
Microsoft Lumia 550 RM-1127 8GB (GSM Only, No CDMA) Factory Unlocked 4G/LTE - International Version No Warranty (Black) : Cell Phones & Accessories - Amazon.com
Amazon.com: Microsoft Lumia 550 RM-1127 8GB (GSM Only, No CDMA) Factory Unlocked 4G/LTE - International Version No Warranty (Black) : Cell Phones & Accessories