IIRC, you can use the usage app for Spark by just opening it while being connected to 3G?
But I'm pretty sure it still has a number tho, maybe ring Spark to find it if you don't have the SIM pack or anything. When we got a Voda data only sim it had the number for it on the pack so you could register online.
Edit: m.spark.co.nz/yt for same info while on 3G/4G
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