sim card and kmw88

I just bought the kmw88 and inserted my sim card from my Samsung phone(sprint service) when I power up the watch it shows a 3g signal but when I dial a number it says no celluar network available.iam I missing  a step to get the sim card to work in the watch. can u give a step by step to set up on watch

Jan 1, 2018 20:53:27 GMT 1 clevebill said:
I just bought the kmw88 and inserted my sim card from my Samsung phone(sprint service) when I power up the watch it shows a 3g signal but when I dial a number it says no celluar network available.iam I missing  a step to get the sim card to work in the watch. can u give a step by step to set up on watch

check APNs.