# Dropped Call Records

## Dataset Description

Records of unsuccessful calls with detailed failure reasons and network conditions

## Dataset Information

- **Category**: Network Performance and Operations
- **Format**: CSV, Parquet
- **Rows**: 100,000
- **Columns**: 11
- **Date Generated**: 2025-10-05
- **Location**: `data/dropped_call_records/`

## Schema

| Column | Type | Sample Values |
|--------|------|---------------|
| `drop_id` | String | DROP00000001 |
| `timestamp` | Datetime | 2025-09-29 22:19:27 |
| `operator` | String | MTN |
| `calling_number` | String | +2348138619599 |
| `called_number` | String | +2348054573294 |
| `tower_id` | String | JOS-9135 |
| `city` | String | Jos |
| `call_duration_before_drop` | Integer | 320 |
| `drop_reason` | String | tower_overload |
| `signal_strength_dbm` | Integer | -102 |
| `network_type` | String | 3G |

## Sample Data

```
     drop_id           timestamp operator calling_number  called_number tower_id     city  call_duration_before_drop       drop_reason  signal_strength_dbm network_type
DROP00000001 2025-09-29 22:19:27      MTN +2348138619599 +2348054573294 JOS-9135      Jos                        320    tower_overload                 -102           3G
DROP00000002 2025-09-06 06:40:38  9mobile +2348098254646 +2349029056121 ABE-5633 Abeokuta                        146 equipment_failure                  -77           4G
DROP00000003 2025-09-26 01:13:35      MTN +2347061520863 +2348099817838 ABA-3864      Aba                        570 equipment_failure                  -76           4G
```

## Nigerian Context

This dataset incorporates authentic Nigerian telecommunications characteristics:

- **Geographic Coverage**: Major Nigerian cities including Lagos, Abuja, Kano, Port Harcourt, Ibadan
- **Operators**: MTN, Airtel, Glo, 9mobile with realistic market shares
- **Phone Numbers**: Nigerian format (+234 prefixes)
- **Currency**: Nigerian Naira (NGN)
- **Time Zone**: West Africa Time (WAT, UTC+1)
- **Network Types**: 2G, 3G, 4G, 5G distribution

## File Formats

### CSV
```
data/dropped_call_records/dropped_call_records.csv
```

### Parquet (Recommended)
```
data/dropped_call_records/dropped_call_records.parquet
```

## Loading the Dataset

### Python (Pandas)
```python
import pandas as pd

# Load CSV
df = pd.read_csv('data/dropped_call_records/dropped_call_records.csv')

# Load Parquet (recommended for large datasets)
df = pd.read_parquet('data/dropped_call_records/dropped_call_records.parquet')
```

### Python (PyArrow)
```python
import pyarrow.parquet as pq

# Load Parquet
table = pq.read_table('data/dropped_call_records/dropped_call_records.parquet')
df = table.to_pandas()
```

## License

MIT License - For educational and research purposes

## Citation

```
Nigerian Telecom Datasets - Dropped Call Records
Generated: 2025-10-05
Category: Network Performance and Operations
Rows: 100,000
```

## Related Datasets

This dataset is part of the Nigerian Telecom Datasets collection, which includes 34 datasets covering network performance, customer behavior, financial transactions, infrastructure, geospatial data, customer experience, and emerging technologies.