I use Vodafone's 1GB mobile dongle with no problems. You can also buy 2GB and 3GB dongles and the good thing is that your credit does not expire after 30 days.
I would ditch 3 and go with Vodafone, which is the best mobile broadband provider.
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.