From 11th July, finding a high speed public Wi-Fi network for your iPhone could get a lot easier, as O2 has done a deal with BT Openzone to open up over 3,000 hotspots. iPhone users will then get free, unlimited access to these hotspots, just as they currently do on the Cloud network, with no change to their monthly tariff. The total number of free UK hotspots now available to iPhone users (or …