Hi rendellam, if you received a confirmation that your roaming was successfully activated and with maintaining balance of 100, you should be receiving a signal by now. Another way is, try to manual select on your network setting, then select which local telco you want to use in order to register your sim to the network.
You should maintain a 100 pesos airtime balance to be able to activate your roaming. Kung wala ka pa ding signal by now, ask someone from your family in the Philippines to call 211 for roaming activation. Kelangan alam niya yung roaming number mo, plus make it sure na meron kang 100 pesos airtime balance. You will be advised to wait for 24hours prior to activation pero sometime it activates instantly. Kung after 24 hours wala pa din, update the CSR regarding your roaming issue.