iPhone users on the T-Mobile network are reporting freezes, restarts and blue screen of death crashes.

According to the reports, iPhone 5S, iPhone 6 and iPhone 6 Plus devices running iOS 8.1 or 8.3 on the T-Mobile network are affected. The issue is being blamed on an update pushed to the devices to enable Wi-Fi Calling.

Several possible fixes have been suggested:

Disable Wi-Fi Calling.

Hard reset the iPhone (simultaneously hold down the Home and Sleep/Wake button until the Apple logo startup screen appears).

Delete old text messages from the past few days.

Factory restore the iPhone using iTunes.

Users have had mixed success with these fixes, and it is likely that those affected will have to wait for an official fix from T-Mobile.

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