try to limit avatars to 50K and signatures to 100k and make everyone post thumbnail instead of full images.

and host them externally as everybody told you here earlier.

Put your site name on every image you host for your forum to prevent leeching it
or apply this
http://www.besthostingforums.com/for...ead.php?t=1732

Check out if someone DDos your site or not.

All of these could abuse your bandwidth.

If everything fine, then your host play with you and want you pay extra bandwidth fees.
Prince Reviewed by Prince on . bandwidth problem hello i need ur kind help please. my site is hackerz-bb.info. onething i wld like to ask u that my board uses phpbb3(with couple of mods) we are 3 star rated site from starting(dec -08) and get 40-50 user online alltime. but my board is consuming daily 3-4 gb bandwidth which i think is abnormal for starter site like this. is this amount of BW usuage is normal? i run out of BW few days ago. Rating: 5