Technical Limitations
The two-digit transaction reference number means that an entity sending text messages can only have 100 outstanding messages (per session); this can limit performance, but only over a slow network and with incorrectly configured applications on one's SMSC (for example one session, with number of windows greater than 100). In practice it does not have any impact on delivery throughput.
The EMI UCP documentation specifies a default alphabet of IRA (eq ASCII on 7bit). In practice users default to the GSM-7 alphabet, which is almost the same as ASCII on 7 bit, except for a few characters - for example '_' (underline).
Read more about this topic: EMI (protocol)
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