Spark is looking into providing customers a free landline re-route when things go wrong with its mobile network.

A countrywide network outage yesterday rendered many mobile phones useless.

Spark's staff are investigating why a bypass system didn't kick in after a hardware fault on one of its exchanges.

While the error was corrected in the afternoon, intermittent disruptions affecting text, call and data services continued into the evening.

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CEO Home, Mobile and Business Jason Paris says the event was a one-off that caught them off guard.

The company will be looking into whether a blanket reroute would be possible, and if so, where could it be applied, he said.

Yesterday's outages were reported from as far south as Dunedin and north to Auckland, with complaints flooding the company's Facebook page from 9am.

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Update at 7:33pm: All mobile services including data should now be back to normal. Please try restarting your phone if you're still having issues, and if that doesn't fix it, jump on live chat (www.spark.co.nz/chat) or send us a private message with your phone number, and we can take a look.

Thanks for your patience, and apologies again for the hassle!

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All Spark customers should now be able to make mobile voice calls and send texts as normal. However some customers may be having data issues, particularly on 4G. We're still working on fixing this.

If calls and texts aren't working for you, turning flight mode on and off again, or restarting your phone, may hurry it up to talk to the network again.

We know this is a real pain, and we’re sorry for the hassles this has caused. Thanks again for your patience and we’ll have everyone back up and running as soon as possible.

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More than 260 of Spark's 1500 mobile sites across the country were impacted, a spokesman said yesterday, apologising to customers.