To AD
Additionally: this problem (Network selection in border areas) is recognized in Rel-7. Moreover, IMSI DETACH/ATTACH can’t to resolve this problem,because the mobile will look for the Registered network.
It is indicated:
“The performance of PLMN selection in border areas should be improved, as it has been noted that network operators are advising their customers to manually select the HPLMN to avoid accidental roaming.”