I am sorry but the answer above is not correct. the ECACC/Sigma links goes to a cell line called 1.1B4 which is not the cell lime described in the 2011 publication:
http://web.expasy.org/cellosaurus/CVCL_1778
The Weir news article comment on a paper from Ravassard et al describing the cell line EndoC-betaH1:
http://web.expasy.org/cellosaurus/CVCL_L909
EndoC-betaH1 is a bona fide pancreatic beta-cell line while the 1.1B4 cell line (as well as 1.1E7 and 1.4E7) are fusion of the PANC-1 pancreatic adenocarcinoma cell line with a beta-cell line.
I just found out that EndoC-betaH1 as well as two other cell lines are now available at: