What app do I need to use for this? I have had a similar one in the past that worked great! It used jahkimba or something like that.

Unsure because instructions or app info did not come with the ring. It was simply in a zip lock bag alone.. I still have not used it

Can you make calls on this?

It doesn't have a calling function

Smart Ring No Charge Depth Waterproof Universal Wear Nfc Magic

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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18436CFA

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Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

About this item Through the NFC radio frequency communication technology and mobile phone connection to the mobile phone function operation and sharing of data. No charge / depth waterproof, built-in ultra-sensitive NFC chip, no electricity to work, easy to wear. Multi-functional NFC smart ring, the main function is to store and exchange personal information, as well as mobile content and personal privacy encryption unlock. Lock / unlock the program, select the application you want to lock / unlock, write the smart ring, only the ring touch the phone to start the application, to protect personal privacy. Beautiful appearance, easy to use. ›See more product details

Smart Ring - No Charge, Depth Waterproof, Universal Wear NFC Magic Wearable Device for Mobile Phone (Size 11)

Specifications

ASIN	B07Y32BWKT
Additional Features	NFC
Age Range Description	Adult
Band Color	black
Band Material Type	Metal
Best Sellers Rank	#128,757 in Electronics ( See Top 100 in Electronics ) #363 in Smart Rings #2,213 in Smartwatches
Brand	Wendry
Built-In Media	Smart Ring, Instruction Manual
Case Material Type	Metal
Clasp Type	Tang Buckle
Closure Type	Buckle
Color	size11
Communication Feature	NFC
Compatible Devices	Smartphone
Compatible Phone Models	Android devices with NFC capabilities
Connectivity Technology	NFC
Controller Type	Ring
Customer Reviews	2.5 out of 5 stars 75 Reviews
Display Type	LCD
GPS	No GPS
GPS Geotagging Functionality	No GPS
Human Interface Input	Buttons
Item Dimensions	1.57 x 1.97 x 0.2 inches
Item Dimensions D x W x H	0.2"D x 1.97"W x 0.2"H
Item Weight	0.01 kg
Manufacturer	Wendry
Metrics Measured	NFC
Model Name	NFC Multi-function Smart Ring
Model Number	[WN-SR01]
Operating System	Android
Resolution	240 x 240
Screen Size	1.57 inches
Shape	Round
Special Feature	NFC
Sport Type	Swimming
Style Name	Modern
Supported Application	Phone
Target Audience	Unisex Adults
UPC	719855717178
Unit Count	1 Count
Warranty Type	Limited
Water Resistance Level	Waterproof
Waterproof Rating	IPX0
Wearable Computer Type	Smart Ring
Wireless Communication Standard	Radio Frequency
Wireless Compability	Radio Frequency

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Customer service was outstanding when I had questions about the product.

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Good experience, but the tracking updates could be better.

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