code: func (manager *Manager) SavePhonenumberValidationInformation(info *PhonenumberValidationInformation) (err error) {
  	mgoCollection := db.GetCollection(manager.session, mongoOngoingPhonenumberValidationCollectionName)
  	_, err = mgoCollection.Upsert(bson.M{"phonenumber": info.Phonenumber}, info)
  	return
  }
docs: //SavePhonenumberValidationInformation stores a validated phonenumber.