Can I use an iPhone 4 sim card in an iPhone 7 Plus?
I bought my mom a new phone. She's been using a refurbished 4 for 5 years now. I just bought her the 7 Plus. She uses an off brand carrier so I can't take it to a Sprint or Verizon store. Can I put her current 4 sim card into the 7 Plus and the new phone work as all our current phones do?