Pebble Watch -> the company was acquired by Fitbit in late 2016, and Fitbit eventually announced it would shut down Pebble's web services.
It is highly recommended to always download / purchase apps, music, ringtones, etc. from App Store or iTunes Store.
was I hacked ?
No, if you haven't jailbroken your iPhone, it's not possible.
is there a virus?
No, remove the download, the see -> Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch
Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch - Apple Support
See these Apple articles below:
If you see No Service, Searching, or SOS on your iPhone or iPad
If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support
Manually update your carrier settings on your iPhone or iPad
Manually update your carrier settings on your iPhone or iPad - Apple Support
Update your network provider settings manually on your iPhone or iPad
Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)
If you see a Cellular, Ultra Wideband, or Apple Pay Issue message after an iOS update or restart
If you see a Cellular, Ultra Wideband, or Apple Pay Issue message after an iOS update or restart - Apple Support
Low Power Mode is On.
Charge the iPhone & wait until the battery is fully charged (100%).
The Low Power Mode will turned off automatically.