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'A true Silicon Valley insider' Wired Why do some products take off? And what can we learn from them? The hardest part of launching a product is getting started. When you have just an idea and a handful of customers, growth can feel impossible. This is the cold start problem. Now, one of Silicon Valley's most esteemed investors uncovers how any product can surmount the cold start problem - by harnessing the hidden power of network effects. Drawing on interviews with the founders of Uber, LinkedIn, Airbnb and Zoom, Andrew Chen reveals how any start-up can launch, scale and thrive. _ 'Chen walks readers through interviews with 30 world-class teams and founders, including from Twitch, Airbnb and Slack, to paint a picture of what it takes to turn a start-up into a massive brand' TechCrunch 'Articulates the stages that every product must go through to be successful . . . and illustrates what companies need to do to achieve them' Forbes

- This phone is unlocked and compatible with any carrier of choice on GSM and CDMA networks (e.g. AT&T, T-Mobile, Sprint, Verizon, US Cellular, Cricket, Metro, Tracfone, Mint Mobile, etc.). - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service.

Size: 64GB    Color: Blue    Service Provider: Unlocked    Product grade: Renewed

- This phone is compatible with carriers on the GSM network (e.g. AT&T, T-Mobile, Metro). - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service. - The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charger and charging cable. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

- Fully unlocked and compatible with any carrier of choice (e.g. AT&T, T-Mobile, Sprint, Verizon, US-Cellular, Cricket, Metro, etc.). - Inspected and guaranteed to have minimal cosmetic damage, which is not noticeable when the device is held at arm's length. - Successfully passed a full diagnostic test which ensures like-new functionality and removal of any prior-user personal information. - The device does not come with headphones or a SIM card. It does include a charging cable that may be generic. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Color: Blue    Size: 128GB    Service Provider: Unlocked    Product grade: Renewed

- Fully unlocked and compatible with any carrier of choice (e.g. AT&T, T-Mobile, Sprint, Verizon, US-Cellular, Cricket, Metro, etc.). - Inspected and guaranteed to have minimal cosmetic damage, which is not noticeable when the device is held at arm's length. - Successfully passed a full diagnostic test which ensures like-new functionality and removal of any prior-user personal information. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Size: 256GB    Color: Blue    Service Provider: Unlocked    Product grade: Renewed

- This device is locked to AT&T only and not compatible with any other carrier. - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service. - The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charger and charging cable. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Color: Red    Size: 128GB    Service Provider: AT&T    Product grade: Renewed

- This device is locked to Verizon only and not compatible with any other carrier. - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service. - The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charger and charging cable. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Color: Red    Size: 128GB    Service Provider: Verizon    Product grade: Renewed

- Built for the Next Generation of Gaming. Game and multitask without compromise powered by Intel’s performance hybrid architecture on an unlocked processor. - Integrated Intel UHD 770 Graphics - Compatible with Intel 600 series and 700 series chipset-based motherboards - Intel Core i7 3.60 GHz processor offers more cache space and the hyper-threading architecture delivers high performance for demanding applications with better onboard graphics and faster turbo boost - The processor features Socket LGA-1700 socket for installation on the PCB - 25 MB of L3 cache to boost the instruction processing and system performance - Intel 7 Architecture enables improved performance per watt and micro architecture makes it power-efficient

- This phone is compatible with carriers on the GSM network (e.g. AT&T, T-Mobile, Metro). - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service. - The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charger and charging cable. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Size: 256GB    Color: Red    Service Provider: GSM Carriers    Product grade: Renewed

- This phone is compatible with carriers on the GSM network (e.g. AT&T, T-Mobile, Metro). - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service. - The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charger and charging cable. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Color: Green    Size: 64GB    Service Provider: GSM Carriers    Product grade: Renewed

- This phone is compatible with carriers on the GSM network (e.g. AT&T, T-Mobile, Metro). - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service. - The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charger and charging cable. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Color: Blue    Size: 64GB    Service Provider: GSM Carriers    Product grade: Renewed

- This device is locked to AT&T only and not compatible with any other carrier. - Please check with your carrier to verify compatibility. - When you receive the phone, insert a SIM card from a compatible carrier. Then, turn it on, connect to Wi-Fi, and follow the on screen prompts to activate service. - The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charger and charging cable. - Tested for battery health and guaranteed to have a minimum battery capacity of 80%.

Color: Green    Size: 64GB    Service Provider: AT&T    Product grade: Renewed