|If I understand your last reply (#14) correctly - you cannot connect your iPhone to the "company" wifi access point?|
wifi (no connection) at work may be due to the access point (presumably it's provided by your company) having a lockdown applied; only permitted devices allowed to connect.
It's part of the standard wifi security routine - mac filtering... mac addresses permitted to connect "must" be on the list of those allowed in. If they're not on the allowed/permitted list - then no connection.
If you can connect to wifi at work and get to other websites but not "your" website.. that may be down to company firewall settings? How chummy/friendly are you with your company IT support?
It might be worth to ask them to have a look-see at the situation re' your iPhone and accessing your website via company wifi. Explain it's a test situation only and see if they will assist - if only to determine if there is block of sorts on the company wifi that is involved (at work). That you can access your website at home (over wifi) does seem to suggest your iPhone is basically OK; that the problem is elsewhere re' a given wifi point.
However I suspect that what you're saying is that you cannot connect to your website via the company wifi, but can do so at home. Also you can access other websites via the company wifi OK?
To clarify a little re' your friend's iPhone(?); can (s)he access your website via his/her iPhone using wifi and the LTE system?
Incidentally I can access your website via my iPad(2), iPhone5c and my Mac systems; and also a windows system - no problems; ethernet or wifi accordingly. I'm in the UK at present - that little place just the west of the EEC...