Hi, Optus should not be charging for 3G data when the data is going via WiFi. It is more likely that some app on the phone is using 3G regardless of WiFi being available. When Optus do charge for data, they charge is blocks -- in your case, 1MB blocks and at a very high cost of $1.32 per MB. My own mobile has data at 2c/MB ... that's it, but you need a corporate type account for this -- although that is not a big deal, either $5 access per month for just one service or $2.50 each for more than one service (there is no phone call capability though on these plans). They also give you a static IP address. Oh and data is counted per KB, not per MB. So, the currently available options from my provider don't suit for emergency calls or SMS. However, a "real" emergency call can be made without even having a SIM in a phone (000 calls). Although, you can use a service like Viber to message and make calls via 3G data. SMS b/w Viber users has no cost, just a tiny bit of data. Viber calls might not work well due to 3G latency issues though. Order page [with my agent code..... use it if you like, I would appreciate it] : https://www.exetel.com.au/hspa_order/business_wireless_form.php?agent_code=V... *** Data (both up and down) is charged per kilobyte and the monthly bill is rounded to the nearest megabyte. Premium Mobile Broadband Plan Inclusions With each Exetel Post Paid Mobile Broadband plan you also get the following additional facilities: No contract term 10 email addresses in the form of - yourname@exemail.com.au 200 megabytes of user web space **** A permanent IP address **** (with the ability to change it if you wish to do so at any time) Usage meter that is regularly updated *** More details of the particular plans are available here: http://www.exetel.com.au/business-mbb-pricing.php -- Kind Regards AndrewM Andrew McGlashan Broadband Solutions now including VoIP Current Land Line No: 03 9012 2102 Mobile: 04 2574 1827 Fax: 03 9012 2178 National No: 1300 85 3804 Affinity Vision Australia Pty Ltd http://www.affinityvision.com.au http://adsl2choice.net.au In Case of Emergency -- http://www.affinityvision.com.au/ice.html