Gsm Triband

If I buy a companion and said network standard GSM tri-band deos that mean it works in the United Kingdom?
If I buy a partner and the standard GSM Triband network said deos that mean it works in the United Kingdom? Thank you
Not unless you've unlocked and open to all networks.
ZOHO V8+ 3.2″ Touch LCD Triband GSM Cell Phone with 3MPx