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iPhone 4s, iOS 9
See -> If you can't activate your iPhone or iPad (Wi-Fi + Cellular)
If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
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Community members who reach Level 5 in the community can create User Tips to share knowledge about Apple products. Check out this User Tip created by Lawrence Finch: When to charge your iPhone or iPad
Community members who reach Level 5 in the community can create User Tips to share knowledge about Apple products. Check out this User Tip created by Lawrence Finch: When to charge your iPhone or iPad