code: func ReadHLR(c *messagebird.Client, phoneNumber string, params *Params) (*hlr.HLR, error) {
  	urlParams := paramsForLookup(params)
  	path := lookupPath + "/" + phoneNumber + "/" + hlrPath + "?" + urlParams.Encode()
  
  	hlr := &hlr.HLR{}
  	if err := c.Request(hlr, http.MethodGet, path, nil); err != nil {
  		return nil, err
  	}
  
  	return hlr, nil
  }
docs: // ReadHLR performs a HLR lookup for the specified number.