Can I use a T-mobile iPhone 5s with Straight Talk sim?

I'm currently with T'mobile. I'm looking to lower my bill by switching to Straight Talk on t'mobile's network. Its an iPhone 5s, and its not unlocked. I been hearing alot of ppl saying it will work, just wanted to clarify.

Yes, it will work. You can use T-Mobile Straight Talk SIM's on phones locked to T-Mobile and it will work fine, since you're not actually changing the network.

  • Which iPhones can use a Straight Talk SIM Card? I want to buy an iPhone that can be used for Straight Talk off of eBay, but I'm not sure which ones I can use? From the iPhone, 3G, 3GS, 4, 4G, and 5, which are compatible?
  • Unlocked iPhone 4S with T-Mobile SIM from Straight Talk? I want to get an iPhone and use it on Straight Talk's network. If I get an unlocked iPhone and get a T-Mobile SIM from Straight Talk (I understand I'll have to cut it down from a regular size to a micro size), will it work on the network? Obviously I don't want to invest $500+ in this and it won't work.
  • Straight talk t mobile compatible sim in iphone? Willa straight talk t mobile compatible sim card work if I cut it and put it in my iPhone 4 at&t?
  • I have a verizon iPhone 5 & I cut down a straight talk sim to nano sim? I want to know that when you insert the SIM card in the iPhone, is it suppose to show the signal & say HOME, or just say no service, & also I have not put any minutes or active it yet because I called straight talk & told them & they said verizon iPhone five will not work, & how come some people say it does work?