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The following applies to 7-bit text messages:
The allowed character set is given below. You do not have to transliterate any characters to the GSM characterset: this is done automatically for you as far as possible. All characters given in the GSM 03.38 specification are supported.
For background, see this Wikipedia.org article. Note that under certain circumstances, characters not included in this list can be sent as 16-bit Unicode, instead.
Any characters that you submit which do not fall within this set, will be replaced by a full stop or question mark. Your submission will not fail.
| Character | ASCII value | Hex value |
| [newline] | 10 | 0A |
| [carriage return] | 13 | 0D |
| [space] | 32 | 20 |
| ! | 33 | 21 |
| " | 34 | 22 |
| # | 35 | 23 |
| $ | 36 | 24 |
| % | 37 | 25 |
| & | 38 | 26 |
| ' | 39 | 27 |
| ( | 40 | 28 |
| ) | 41 | 29 |
| * | 42 | 2A |
| + | 43 | 2B |
| , | 44 | 2C |
| - | 45 | 2D |
| . | 46 | 2E |
| / | 47 | 2F |
| 0 | 48 | 30 |
| 1 | 49 | 31 |
| 2 | 50 | 32 |
| 3 | 51 | 33 |
| 4 | 52 | 34 |
| 5 | 53 | 35 |
| 6 | 54 | 36 |
| 7 | 55 | 37 |
| 8 | 56 | 38 |
| 9 | 57 | 39 |
| : | 58 | 3A |
| ; | 59 | 3B |
| < | 60 | 3C |
| = | 61 | 3D |
| > | 62 | 3E |
| ? | 63 | 3F |
| @ | 64 | 40 |
| A | 65 | 41 |
| B | 66 | 42 |
| C | 67 | 43 |
| D | 68 | 44 |
| E | 69 | 45 |
| F | 70 | 46 |
| G | 71 | 47 |
| H | 72 | 48 |
| I | 73 | 49 |
| J | 74 | 4A |
| K | 75 | 4B |
| L | 76 | 4C |
| M | 77 | 4D |
| N | 78 | 4E |
| O | 79 | 4F |
| P | 80 | 50 |
| Q | 81 | 51 |
| R | 82 | 52 |
| S | 83 | 53 |
| T | 84 | 54 |
| U | 85 | 55 |
| V | 86 | 56 |
| W | 87 | 57 |
| X | 88 | 58 |
| Y | 89 | 59 |
| Z | 90 | 5A |
| _ | 95 | 5F |
| a | 97 | 61 |
| b | 98 | 62 |
| c | 99 | 63 |
| d | 100 | 64 |
| e | 101 | 65 |
| f | 102 | 66 |
| g | 103 | 67 |
| h | 104 | 68 |
| i | 105 | 69 |
| j | 106 | 6A |
| k | 107 | 6B |
| l | 108 | 6C |
| m | 109 | 6D |
| n | 110 | 6E |
| o | 111 | 6F |
| p | 112 | 70 |
| q | 113 | 71 |
| r | 114 | 72 |
| s | 115 | 73 |
| t | 116 | 74 |
| u | 117 | 75 |
| v | 118 | 76 |
| w | 119 | 77 |
| x | 120 | 78 |
| y | 121 | 79 |
| z | 122 | 7A |
| ¡ | 161 | A1 |
| £ | 163 | A3 |
| ¤ | 164 | A4 |
| ¥ | 165 | A5 |
| § | 167 | A7 |
| ¿ | 191 | BF |
| Ä | 196 | C4 |
| Å | 197 | C5 |
| Æ | 198 | C6 |
| Ç | 199 | C7 |
| É | 201 | C9 |
| Ñ | 209 | D1 |
| Ö | 214 | D6 |
| Ø | 216 | D8 |
| Ü | 220 | DC |
| ß | 223 | DF |
| à | 224 | E0 |
| ä | 228 | E4 |
| å | 229 | E5 |
| æ | 230 | E6 |
| è | 232 | E8 |
| é | 233 | E9 |
| ì | 236 | EC |
| ñ | 241 | F1 |
| ò | 242 | F2 |
| ö | 246 | F6 |
| ø | 248 | F8 |
| ù | 249 | F9 |
| ü | 252 | FC |
Greek characters are mapped onto extended ASCII characters which are unused in the GSM character set:
| Greek characters | |||
| Character | Equivalent | ASCII value | Hex value |
| Δ (delta) | Ð | 208 | D0 |
| Φ (phi) | Þ | 222 | DE |
| Γ (gamma) | ¬ | 172 | AC |
| Λ (lambda) | Â | 194 | C2 |
| Ω (omega) | Û | 219 | DB |
| Π (pi) | º | 186 | BA |
| Ψ (psi) | Ý | 221 | DD |
| Σ (sigma) | Ê | 202 | CA |
| Θ (theta) | Ô | 212 | D4 |
| Ξ (xi) | ± | 177 | B1 |
Example of a message body containing the Greek character gamma (decimal 172 == hex 0xAC):
This+is+a+gamma+%AC
Extended GSM characters are only supported on certain networks - please test before sending large volumes. Submit the (ASCII 187) character, followed by one of the following:
| Character | Equivalent | ASCII value | Hex value |
| form feed | newline | 10 | 0A |
| ^ (circumflex accent/caret) | dc4 | 20 | 14 |
| { | ( | 40 | 28 |
| } | ) | 41 | 29 |
| \ | / | 47 | 2F |
| [ | < | 60 | 3C |
| ~ | = | 61 | 3D |
| ] | > | 62 | 3E |
| | | @ | 64 | 40 |
| Euro sign | € | 101 | 65 |