Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Network | Company | Mobile Prefixes | Mobile Examples | Landline Prefixes | Landline Examples | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| Beeline | Sotelco Ltd. | 031 (+ 7 digits)\n060 (+ 6 digits)\n066 (+ 6 digits)\n067 (+ 6 digits)\n068 (+ 6 digits)\n090 (+ 6 digits) | +855 31 234 5678\n+855 60 234 567 | NDC + '46' + 4-5 digits | +855 23 461 2346\n+855 64 461 234 |  |
| Mobitel | CamGSM Co., Ltd. | 011 (+ 6 digits)\n012 (+ 6-7 digits)\n017 (+ 6 digits)\n061 (+ 6 digits)\n076 (+ 7 digits)\n077 (+ 6 digits)\n078 (+ 6 digits)\n085 (+ 6 digits)\n089 (+ 6 digits)\n092 (+ 6 digits)\n095 (+ 6 digits)\n099 (+ 6 digits) | +855 76 234 5678\n+855 12 123 4567\n+855 12 234 567\n+855 92 123 456 | - | - | Also known as Cellcard\nIncorporates the former Mfone |
| CooTel | Xinwei (Cambodia)\nTelecom Co., Ltd | 038 (+ 7 digits) | +855 38 383 8380 | NDC + '47' + 4-5 digits | +855 23 471 2346\n+855 64 471 234 |  |
| Excell | GT-TELL (Cambodia)\nInvestment Co., Ltd. | 018 (+ 6 digits) | +855 18 234 567 | - | - |  |
| Metfone | Viettel (Cambodia)\nPte., Ltd. | 088 (+ 7 digits)\n097 (+ 7 digits) | +855 88 234 5678\n+855 97 234 5678 | - | - |  |
| qb | Cambodia Advance Communications\nCo., Ltd. (CADCOMMS) | 013 (+ 6 digits)\n080 (+ 6 digits)\n083 (+ 6 digits)\n084 (+ 6 digits) | +855 13 234 567 | - | - |  |
| Smart | Smart Axiata Co., Ltd | 010 (+ 6 digits)\n015 (+ 6 digits)\n016 (+ 6 digits)\n069 (+ 6 digits)\n070 (+ 6 digits)\n081 (+ 6 digits)\n086 (+ 6 digits)\n087 (+ 6 digits)\n093 (+ 6 digits)\n096 (+ 7 digits)\n098 (+ 6 digits) | +855 96 234 5678\n+855 10 234 567 | NDC + '45' + 4-5 digits | +855 23 451 2346\n+855 64 451 234 | Incorporates the former Hello Axiata |
Question:
what is the first mobile prefix for sotelco ltd.
Answer:
031