Why is it that sometimes my web application does not work on the iPhone?

Question

I have a web application that uses login and sessions (cookies). Why is it that sometimes, when the iPhone is going slow with the 3G network (super super slow), the iphone doesn't see the cookies?

Cookies don't work when the iPhone network is slow!!!

Answer 1

When in the slow network, is it still 3G or is it EDGE/GPRS (2G) network? If cookie behavior is different between 3G and EDGE/GPRS, it might be your carrier's responsibility. You carrier might delete header in HTTP request/response. You'd better have both client-side and server-side log to verify this.