We heard a rumor late last month about an Android smartphone called the Impulse; it was supposedly made by Samsung, and might be one of the first LTE devices on AT&T’s fledgling network, but there wasn’t much to go on besides that one render of the phone. As fate would it have it, it looks like the name was spot-on, but nearly everything else about that rumor is turning out to be wrong. In reality, the Impulse is manufactured by Huawei, and while it will find a home on AT&T, it won’t be an LTE device.

AT&T announced the Huawei Impulse 4G this morning, with plans to start selling the smartphone on September 18 for about $30 on-contract. As you should be able to tell from that price point, you can forget about dual-cores or upper-tier features. Instead you’ll get a handset with a 3.8-inch WVGA display, five-megapixel main camera, and that ships only running Froyo.

One of our eagle-eyed readers spotted the Huawei similarities when we first got that peek at the phone, and suggested it might be the Ideos X5. Sure enough, these specs AT&T has provided match-up with what know of the X5 (below). If this is the same hardware, it should have a processor running at 800MHz and 512MB of RAM.