SOS on an iPhone turns on because of pressing the Sleep/Wake button quickly five times or holding the side and a volume button simultaneously. Jailbreaking your iPhone can also cause it to enter SOS mode. Reboot your iPhone by holding either volume button and the side button simultaneously, then sliding the power-off slider.. Update your iPhone or iPad to the latest version of iOS or iPadOS. Go to Settings > Cellular. Then: For iPhone, tap Cellular Data Options, then turn on Enable LTE. For iPad, turn on LTE. If you still see No Service after following these steps, contact your carrier.

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During the outage, Optus mobile customers reported their phones showing SOS on the signal indicator - a sign the network is down but the phone should still able to access alternate networks in.. Right now the carriers that seem to be affected include some of the most popular including AT&T, Verizon, and T-Mobile. Those affected by the outage aren't limited to just one part of the country, either.