Can't connect devices to iPhone?

I got a new iPhone and now I can't connect my Fitbit or Pokémon Go Plus devices.

Is your Fitbit and Pokémon device still connected to your previous phone?

I mean I found a pokemon go plus outside tried to connect and it fails a lot.

  • One laptop can connect to our home Wi-Fi network but no other devices can connect? We recently set up a wireless internet connection in our house. One laptop can connect to it (the one I'm currently on) but no other devices can connect to it. It says our "Network Security Key" is mismatched. I have tried typing in all the different codes on both the router and modem on both our second laptop and an iPhone 5. How can I fix this?
  • My Wi-Fi won't connect on my laptop but will connect to my other devices (an iPhone and iPad)? I have a MacBook Air. Sometimes it does connect but other times it just won't. It takes ages connecting and then in the end comes up with the exclamation mark or is just blank. Is this a problem with my laptop? I've tried researching the problem but have found nothing.
  • Is it possible to connect different devices with iCloud, but exclude one of them? My Apple ID is used for my laptop, my iPod, and will be for my iPhone once I get it at the end of the month. A month ago my mother purchased an iPhone and I let her use my Apple ID to make it easier for her and what not. I'm interested in using iCloud for my laptop, iPod, etc. But I don't want it to connect to my mother's iPhone. Is it possible to make sure our things don't go to each others devices? Or if I don't fully comprehend it, could someone explain it to me?
  • I can't connect some devices with my home Wi-Fi? From 2 weeks my wife works fine, but now i can't connect some devices to my home wife network but when i try to connect these devices to another wife router it works fine these devices that can't connect to wife: iPhone, blackberry, xperia tibo & Nokia device, but my laptop & my PC internet cable works fine please help me & sorry for my English Thanks. EX: when i try to connect with my iPhone it says "unable to join the network"