Today I was successful (after numerous calls, tweets, and emails to T-Mobile Customer Service) with getting my iPhone 5s activated. I'd bought mine from the Apple Store online for T-Mobile, unlocked. What's needed from this kit is the activation number (which in my case, T-Mobile actually activate this plan I was switching to without my telling them this #). The microSim in the kit and its number are *not* needed. I ultimately only got to use my phone as a phone when a T-Mobile tech support person got me to get the nanoSIM out of my phone and read off to her (with help from a strong magnifying glass!) *its* number. The actually porting of my old number (from another T-Mobile "dumb" phone only took 2 hrs. Two different T-Mobile customer service reps had both asked me *only* for the kit's microSIM # and that's what had been activated 6 hrs. before I talked to their troubleshooting rep. That's when I found out they needed my (very, very tiny) nanoSIM that came from Apple with the phone. Once I told the rep that #, she had my phone working in seconds(!) Note: the standard phone number to reach T-Mobile voicemail system has *no* choice for customer service or easily reaching a person. I'd been a very happy T-Mobile customer for 8+ years and only this procedure for this phone and plan was full of hoops to jump through until success.
I just got an iPhone 5s a few days ago, unlocked, for T-Mobile, direct from Apple. I'd researched and found that for my needs (having WiFi at home and work most of my day, needing data more than phone minutes) this would be the best plan (and quite a bit cheaper than other plans incl. directly from T-Mobile). Right now as of 10/13/13, the most recent review, dated 6/9/13 is asking about using this with an iPhone 5s. That reviewer lists how to make this work despite the fact that the microSIM included won't fit an iPhone 5s. (Note the fine print from the Walmart page here, a pop-up, that they only list iPhone 4 or 4s. :-( I had called T-Mobile's Customer Service days before my iPhone arrived, asked them if it would be possible for me to use this plan with my iPhone , porting my 9 yrs. long cell number with T-Mobile and was told yes, possible and easy to do. Not true. I spent 2.5 hrs. last Friday at my T-Mobile store and a rep. He called T-Mobile 2x, I called them 2x and we got conflicting answers as to whether this could work (and how). So my iPhone 5s is still not activated. :-( So I'm glad for the hope I got today reading the most recent review I mentioned. I couldn't buy this kit in my town, but tomorrow I drive 3+ hrs. roundtrip to the next nearest Walmart store since our local one is sold out of this kit, won't get them for another 2 wks.(!) :-( The card in this kit is a microSIM, not the nanoSIM my iPhone 5s came with from Apple, but the recent review said the card from this kit isn't needed, but the # of it *is* needed...
According to Apple, Any GSM iPhone 5 model A1428 will support T-Mobile's LTE network and HSPA+ speeds of up to 21 Mbps. To experience DC-HSDPA up to 42 Mbps on T-Mobile, you need an iPhone 5 GSM model that supports T-Mobile's AWS band (1700/2100). Google search HT5720 to read more.