Next week I'm traveling to Tunisia for the first time, and during my stay in Port El Kantaoui I'll have to use internet couple of times and spend 10-30MB.

I'll be staying in El Mouradi Club, but I couldn't find is there wireless internet in hotel nor the prices.

I've listed offers of all 3 GSM operators, and only Orange offers 3G, but with the price of 4DT per MB
Actually, all operaters have same price per kb, but Tunisiana offers add-on, 100MB for 4DT, on the EDGE speed.

Question is, which network is most reliable for internet connection?

If Tunisiana works without problems, I'll survive with EDGE speed

I have, actually, used the TUNISIANA monthly flatrate myself for many months since 2008. Speed has been about 11kB/s around the clock with only a few outages. EDGE works fine in Kantaoui, Sousse and Monastir.

The Orange 3G offers require ALL a contract of 2 years with 6 months prepayment - as nice as 3G is (and it works fine in the big towns of eg. Sousse and Tunis), it does not really justify the money you have to shell out if you only want to use it a few days or weeks.

A good alternative is to go to the cafe/restaurant Mandra Square which offers for its guests FREE WLAN useage, it is only a 5-10 minutes walk away from Kantaoui/Mouradi Club (leave the hotel premises and turn right, it will then be on the left side of the street, on the opposite side of the Royal Kenz hotel) and is open until deep into the night:

http://www.kantaoui.net/mandrasquare-en.htm

The restaurant is currently being expanded and closed due to the work in it, but the cafe/bistro is open.

Mandra Square looks like OK solution.
Since Tunisiana prepaid card is not expensive and you say it works pretty well, I'll try with prepaid+100MB.
Afterall, Mandra Square is 1km away from hotel

Thanx

Update:
I'm using Android cell and mobile operators can not send me automatic settings for GPRS.
Are these settings correct:
APN : internet.tunisiana.com
Adresse IP ou adresse du Proxy : 10.3.2.99
Port : 80
Username : internet
Password : internet

Service activation: *124*4#

These data are correct!