I have been using Gravity for more than a year and so far, I find that this is the best Twitter client for Symbian. I have it installed on my Nokia 5800 XpressMusic and N8. Using Gravity, it’s easy to share photos directly to some photo sharing providers like Twitpic, yfrog, img.ly, or even Flickr. Sound good? Yes.
But, it’s only when your mobile internet provider works without any issues. Until today, I only use two mobile internet service: Telkomsel and XL Axiata. Using Telkomsel, I almost found no problems. Everything is working. Well, not 100% great, but it’s still acceptable. Right now, I use XL internet service. I just want to try its service. Both offer the similar price for its data plan. XL has more offers when purchasing the mobile internet package.

The problem is — again, this is related to Gravity application — everytime I upload a photo, I always got Error: HTTP 401. Telkomsel didn’t give this kind of error. So, is it an issue from XL’s side? Maybe.
Wikipedia says:

401 Unauthorized
Similar to 403 Forbidden, but specifically for use when authentication is possible but has failed or not yet been provided.The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource. See Basic access authentication and Digest access authentication.

Not good.
When I tweeted this problem, my friend Andrayogi also shared a same experience. So far, I’m happy with the internet performance by XL. Yes, I have been using XL service for almost 10 years. And this is the first time I use its ‘unlimited’ data plan. If this problem remains unsolved, I think I will be switching back to Telkomsel.