The iPhone Dev Team has just updated Redsn0w to version 0.9.5b5-5. Some iPhone users were complaining about MMS and APN issues on their jailbroken iOS 4 devices.The official change log is as follows.
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The latest redsn0w beta should fix any APN or MMS issues that users were seeing. It’s safe to re-run it on an already jailbroken iPhone without restoring…just deselect “Install Cydia” if you do that.
Instructions to jailbreak iPhone 3G and iPod touch 2G on iOS 4 using Redsn0w 0.9.5 as usual are exactly similar to the last release. If your phone is already jailbroken, just deselect “Install Cydia” option and re-run the jailbreak. Please read all the instructions posted here carefully before upgrading and jailbreaking your phone on iOS 4.
Once you have jailbroken your phone, you can unlock it using ultrasn0w 0.93 (on any baseband), guide for which is posted here.
You could always get support from UnlockAlliPhone.com about any Unlock & JailBreak issue of any model of iPhone including iPhone 2G,3G & 3GS and also upcoming iPhone 4. They provide Premium Members Support for life time. Means just pay one time a small fee and you will receive support(real human support – avg response time 2 hour) for all present & future version of iPhone.