Though we saw it coming by way of tips and rumors, AT&T has officially discontinued sales of the Apple iPhone 3G.  In an e-mail obtained by BGR, AT&T sales representatives are to refer customers to the 3GS models:

June 4, 2010

iPhone 3G 8 GB is Out of Stock

Effective immediately, iPhone 3G 8GB is Out of Stock.  Please refer all customers to iPhone 3GS 16 GB and 32 GB models.

FAQ:

Q:  When will we receive inventory for iPhone 3G 8GB?
A:  At this time, we do not know when more iPhone 3G 8GB will arrive.

Q:  Are there any iPhone 3G 8 GB available in COR if my customer can purchase there??
A:  Check with your local COR stores to see if they have any inventory available.

Is this a sign of new products to come during next week's WWDC?  Will the 3GS will drop to $99/$149.99 next week?  Time will tell.

Via BGR