Wife's iPhone 4 sim card put into daughter's iPhone 4s?

so wife thinks because our daughter eligible upgrade. can iphone 4s daughter , turn around , switch sims.

please tell me i'm right. cannot legally done

thanks

 

it can. required sign new 2 year contract on line has available upgrade. phone after business.

 

Forums iPhone, iPad, and iPod Touch iPhone iPhone

• iPhone
• Mac OS & System Software
• iPad
• Apple Watch
• Notebooks
• iTunes
• Apple ID
• iCloud
• Desktop Computers
• Apple Music
• Professional Applications
• iPod
• iWork
• Apple TV
• iLife
• Wireless