4 ms·

Older sims dont have 3G capabilities either. (Not sure why)

• kamjam 15y ago
  Mine is defo new enough that it supports that! Anyone know if you need a new sim card to support 4G services?
  • CrazedGeek 15y ago
    IIRC, yes, at least for AT&T's LTE -- HSDPA (and HSUPA, HSPA+, etc) will work just fine with a 3G SIM (since they're just souped-up 3G).
• jerrya 15y ago
  This is something weird that I've discovered too. I am now on T-Mobile (from AT&T) and there are all sorts of T-Mobile features that may or may not work depending on what SIM card you have in your phone. And if they don't work you have to get a new SIM card (that is not guaranteed not to disable other features.) What!? That seems to be the weirdest thing ever. What is going on?
• gergles 15y ago
  Older sims are missing the USIM "applet" that contains the data necessary to negotiate with UMTS networks.