A method comprising: - providing - information on a serving cell that is, at a point of time, serving a mobile terminal (2a;2b;2c) and - information related to a neighbor cell that is, at least substantially at said point of time, observed by said mobile terminal (2a;2b;2c), wherein a) said serving cell is a cell of a first communication network and b) said information on said serving cell comprises a cell identifier of said serving cell that is a globally unique cell identifier, wherein a) said neighbor cell is a non-serving cell of a second communication network and b) said information related to said neighbor cell constitutes a cell identifier that is not a globally unique cell identifier, and wherein said first communication network has an air interface type that is different from an air interface type of said second communication network and/or is operated by an operator that is different from an operator of said second communication network, and - determining or obtaining a position estimate for said mobile terminal (2a;2b;2c), said position estimate determined at least based on positioning-related information for said serving cell and positioning-related information for said neighbor cell, said positioning-related information for said serving cell retrieved at least based on said provided information on said serving cell, and said positioning-related information for said neighbor cell retrieved at least based on said provided information on said serving cell and said provided information related to said neighbor cell, wherein said globally unique cell identifier is interpreted together with said not globally unique cell identifier for retrieving said positioning-related information for said neighbor cell. - providing - information on a serving cell that is, at a point of time, serving a mobile terminal (2a;2b;2c) and - information related to a neighbor cell that is, at least substantially at said point of time, observed by said mobile terminal (2a;2b;2c), wherein a) said serving cell is a cell of a first communication network and b) said information on said serving cell comprises a cell identifier of said serving cell that is a globally unique cell identifier, wherein a) said neighbor cell is a non-serving cell of a second communication network and b) said information related to said neighbor cell constitutes a cell identifier that is not a globally unique cell identifier, and wherein said first communication network has an air interface type that is different from an air interface type of said second communication network and/or is operated by an operator that is different from an operator of said second communication network, and - information on a serving cell that is, at a point of time, serving a mobile terminal (2a;2b;2c) and - information related to a neighbor cell that is, at least substantially at said point of time, observed by said mobile terminal (2a;2b;2c), wherein a) said serving cell is a cell of a first communication network and b) said information on said serving cell comprises a cell identifier of said serving cell that is a globally unique cell identifier, wherein a) said neighbor cell is a non-serving cell of a second communication network and b) said information related to said neighbor cell constitutes a cell identifier that is not a globally unique cell identifier, and wherein said first communication network has an air interface type that is different from an air interface type of said second communication network and/or is operated by an operator that is different from an operator of said second communication network, and - determining or obtaining a position estimate for said mobile terminal (2a;2b;2c), said position estimate determined at least based on positioning-related information for said serving cell and positioning-related information for said neighbor cell, said positioning-related information for said serving cell retrieved at least based on said provided information on said serving cell, and said positioning-related information for said neighbor cell retrieved at least based on said provided information on said serving cell and said provided information related to said neighbor cell, wherein said globally unique cell identifier is interpreted together with said not globally unique cell identifier for retrieving said positioning-related information for said neighbor cell.