I have googled but cannot find anything of relevance.
On my Nokia phone, Joikuspot is one old solution, which kind of works most of the time but the WIFI provided by Joikuspot is ad-hoc, not a proper access point, and many devices will not connect to it (e.g. win8 doesn't; winXP usually does, but there is a bug in XP whereby the laptop then radiates spurious packets afterwards so the network has to be deleted after each use!). Most Android phones have a similar function.
The encryption should ideally be WPA, not WEP, but this doesn't matter much in practice. I think most phones, when used in this way, can do WEP only.
Many thanks for any pointers



