NOTE: Not everyone will be undergoing problems when using their OPO on T-Mobile out-of-the-box, but for those who are, this should solve the issues you are facing.
I've seen quite a few people who have troubles with getting their devices working on their respective GSM carriers. Knowing a friend who has the OPO and made the switch from his prior device (HTC One M8), he was undergoing problems with getting his device up and running and we at some point found the appropriate solution to get full service (LTE and everything). So with that said, below are the steps on how to seamlessly transition to the OPO on T-Mobile USA.
1a. Use your existing Micro SIM card to activate your OnePlus One (existing T-Mobile customers):
This is the preferred method because the SIM card is already working on a previous provisioned T-Mobile phone. If you activate a new SIM card in your OnePlus One, the network will not recognize the device as its IMEI number cannot be cross matched with the device name in T-Mobile's database. As a result, you will get notifications on your phone asking you to "Sign into T-Mobile Network", because your phone isn't "provisioned" to use their data plan.
If your prior device does not use a Micro SIM card, you will need either a SIM Card Cutter, or a SIM Card Adapter (
http://goo.gl/PFdDNE). The adapters are just as expensive as the cutter + adapter combo, so there's no reason to pay just as much for the adapters alone.
1b. Getting a new SIM card and activating it in a T-Mobile branded device (new customers switching to T-Mobile):
If for some reason you obtained a new Micro SIM card from T-Mobile, you will need to make sure to activate it on an existing device that is provisioned to work on the network before placing the SIM card into your OnePlus One. Easiest method is to go into the T-Mobile store and just get the SIM card activated beforehand.
2. Updating the T-Mobile APN:
When you first get your network up and running, it will not come out of the box with the APN settings optimized for the T-Mobile network. In order to change the APN settings, do the following:
- Open Settings
- Tap on Mobile Networks
- Tap on Access Point Names
To get the best results, I would recommend updating the
T-Mobile US LTE APN with the APN settings below, as they came from the pre-set configurations for the latest flagships i.e. HTC One M8:
Name: T-Mobile US LTE
APN: fast.t-mobile.com
Proxy: Not set
Port: Not set
Username: Not set
Password: Not set
Server: Not set
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
MMS proxy: Not set
MMS port: Not set
MCC: 310
MNC: 260
Authentication type: Not set
APN type: default,supl,mms,hipri,dun
APN protocol: IPv4/IPv6
APN roaming protocol: IPv4
APN enable/disable: APN enabled
Bearer: Unspecified
MVNO type: None
MVNO value: Not set
After that, you should be fully up and running on the T-Mobile network with all the network bands available. If there are any other issues, let me know and I'll try my best to clarify the steps.
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