Here is the issue. Instagram will not work on my t-mobile iPhone 4S or new 5C on 4G. I can sign in and then all I get is a white screen saying "Couldn't Refresh Feed". It stopped working on my 4S about 6 months ago for no apparent reason. Here is what I have tried: deleted, reinstalled reset phone settings, tried new phone(5c) sign in as different user created new account All with no luck. I can log in with my instagram account on an iPhone 5 on T-Mobile and it works. It works on my phone with Wi-Fi. The issue seems to be tied to the number(sim card was replaced for 5C) from what I can tell. Any other suggestions? Thanks in advance.